Plaintiff’s first contention is that the court had no jurisdiction to give judgment against him in either of said actions for the reason that he was insane at the time and no guardian had been appointed or appeared for him in either of said actions. This contention cannot be sustained. In both of these actions the relief sought was the recovery of a money judgment only and service of the summons and complaint was made upon the plaintiff herein in person in the county where the actions had been commenced. The court, because of such personal service upon the defendant, had full and complete jurisdiction to hear and determine said actions. If plaintiff, the defendant in said actions, had been theretofore judicially declared to be of unsound mind or incapable of conducting his own affairs, and a guardian had been appointed for him, then the court, because of the provisions of subdivision 4, Section 55, Or. L., could not have acquired jurisdiction over his person by service of summons and complaint on him alone, as in such case the statute requires that “the summons shall be served by delivering a copy thereof, together with a copy of the complaint * * to such guardian and to the defendant personally.” In this state there is no statute except the above that prescribes the manner in which service of summons and complaint shall be made upon insane persons, and except where a guardian for an insane *236person has been appointed as so prescribed, insane persons may be sued and jurisdiction over tbeir persons be acquired by tbe same process as if they were sane. Hence, the court, having acquired full and complete jurisdiction over bis person and over tbe subject matter of tbe actions, bad authority to render said judgments, whether be was sane or insane at tbe time tbe actions were commenced and the judgments rendered.
However, when an insane or idiotic person is a party to any action, suit or proceeding in tbe courts of this state, Section 33 — 1, Or. L., provides that if' be has no guardian or, in tbe opinion of tbe court, bis guardian is an improper or incompetent person, tbe court shall appoint some suitable person to act as guardian ad litem. But this latter statute has no reference to tbe manner in which service shall be made upon an insane person nor does it attempt to limit tbe court’s jurisdiction over tbe person of such insane party. It only prescribes tbe procedure to be followed upon tbe trial of tbe cause.
Tbe judgments complained of were default judgments and it was not made to appear to tbe court that the party defendant to said actions was insane, but even if it had been disclosed to tbe court that tbe defendant was an insane party and tbe court bad failed or refused to appoint a guardian ad litem to defend for him, this would not have deprived tbe court of its jurisdiction over bis person or over tbe subject matter of tbe action and such failure would have been a mere irregularity rendering tbe judgment voidable but not void. Plaintiff’s remedy in such a case would be to appeal or to commence a suit to set aside and vacate tbe judgments. If he had pursued either of these remedies, upon a sufficient *237showing that he was insane, he could have obtained relief, except that in a suit in equity to set aside or vacate the judgments, it would have been necessary for him to show, not only that he was insane, but also that he had a defense to the actions. In this action, however, the plaintiff cannot raise the question of his insanity because this is a mere collateral attack upon the judgment and is not a direct attack brought to set aside or vacate the judgments. Hence, if on account of his alleged insanity the plaintiff is entitled to legal relief he must pursue his remedy by some appropriate action in the original actions or by some direct attack to set aside the judgments. He cannot, in a collateral proceeding, attack either the regularity or validity of these judgments or of the proceedings had in satisfaction thereof.
“As a general rule,” said this court in Harper v. Harding, 3 Or. 361, “a judgment or decree of a court having jurisdiction cannot be attacked collaterally; and when a decree is attacked for want of jurisdiction, it is not a sufficient showing of such lack, to declare that the defendant was insane at the time.” See also Haines v. West, 101 Tex. 226 (105 S. W. 1118, 130 Am. St. Rep. 839); King v. Robinson, 33 Me. 114 (54 Am. Dec. 614); Maloney v. Dewey, 127 Ill. 395 (19 N. E. 848, 11 Am. St. Rep. 131); Johnson v. Pomeroy, 31 Ohio St. 247; 22 Cyc. 1245; 14 R. C. L. 615. Again, in Tustin v. Gaunt, 4 Or. 309, the court quoted with approval from 2 How. (U. S.) 341 (11 L. Ed. 283), as follows: “A court which is competent, by its constitution, to decide on its own jurisdiction, and to. exercise it to a final judgment, without setting forth in their proceedings the facts and evidence on which it is rendered, whose record is absolute verity, not to be impugned by averment, or proof to the *238contrary, is of the first description; there can be no judicial inspection behind the judgment save by appellate power.” And then said, “When, however, the record of a court of general jurisdiction comes in question, a want of jurisdiction cannot be shown by evidence aliunde the record, and ‘no facts or circumstances which do not appear upon the face of what constitutes the record,’ designated in our Code as the judgment-roll, can be used for such purpose, for the reason that ‘the record of a court of superior jurisdiction imports absolute verity, and cannot, therefore, be collaterally impeached from without.’ Hahn v. Kelly, 34 Cal. 402.” The court then defined what constitutes a want of jurisdiction, as follows: “A want of jurisdiction appears upon the face of thé record ‘whenever what was done is stated in the record, and which, having been done, is not sufficient in law to give the court jurisdiction.’ ”
In Morrill v. Morrill, 20 Or. 96, 103 (25 Pac. 362, 23 Am. St. Rep. 95, 11 L. R. A. 155), this court said: “It is said to be an axiom of the law, that when a court has jurisdiction of the subject matter and the parties, its judgments cannot be impeached collaterally for errors of law or irregularity in practice.” In that case the court defined a collateral attack as follows: “A collateral attack on a judgment is any proceeding which "is not instituted for the express purpose of annulling, correcting or modifying sucb decree: 12 Am. & Eng. Ency. of Law, 177.”
We have proceeded thus far upon the theory that the plaintiff herein, the defendant in said actions, was insane, but after a careful examination of the record we find that there is no evidence whatever tending to show that he was insane. The only allegation that plaintiff was insane is contained in the *239reply, and as all new matter alleged in the reply is deemed denied under the statute, the burden of proof was on the plaintiff. There was some evidence tending to show that during the time referred to he was drinking heavily and was neglecting his business, but this is wholly insufficient to establish insanity. After considering all of the evidence in the case we are satisfied that the plaintiff is not now and never has been insane.
Plaintiff contends that because of certain alleged irregularities in the proceedings of the attachment had in the action brought by Allen & Lewis, a corporation, against the plaintiff herein, in which action the real property in question was sold under execution, the sale thereunder was invalid. After the property was sold under execution and the sale thereof was confirmed by order of the court, any irregularity in the attachment at the commencement of the action could not affect the validity of the subsequent sale of the property under execution so far as the rights of the plaintiff in the property are concerned. The Code provides: “An order confirming a sale shall be a conclusive determination of the regularity of the proceedings concerning such sale, as to all persons, in any other action, suit or proceeding whatever.” Section 241, subd. 4, Or. L. So even if this had been a direct attack the statute would be conclusive upon this question.
Plaintiff also contends that because the return of the sheriff of the sales under execution was filed and orders confirming the sales were made on the same day, the orders of confirmation are each invalid. If, instead of being a mere collateral attack, this was a direct proceeding to vacate and set aside these orders and had been seasonably made, plain*240tiff’s contention would be entitled to consideration. But as the court bad jurisdiction of the parties and of tbe subject matter of tbe controversy, these orders are not void when attacked collaterally. If the court acted prematurely or was mistaken upon either the law or the facts, yet it had jurisdiction to make the order, and therefore the order is valid and binding until it is set aside upon appeal or is corrected, modified or annulled in a direct proceeding brought for that purpose. A decision of a court of competent jurisdiction having jurisdiction of the parties and of the subject matter of the suit or action, “however erroneous it may have been, is binding upon the parties until reversed or annulled in some proper proceeding.” Morrill v. Morrill, supra.
As said in McRae v. Daviner, 8 Or. 63, which was a direct and not a collateral attack upon a sheriff’s sale under execution: “Appellant had three remedies: the right to appear and file objections to the order of confirmation of the sale, the right of appeal, and the right of redemption, all of which he has neglected and .failed to avail himself of.”
A written stipulation was filed in the lower court in which the parties to this action stipulated that on ■the twenty-eighth day of. July, 1916, the plaintiff was the owner in fee of the real property described in the complaint, and that if the plaintiff has lost the title thereto, it is by virtue of the execution sales mentioned in defendant’s answer, or one of them. It was also stipulated that some time prior to July 29, 1916, defendant’s intestate went into possession of the property as a tenant of the plaintiff and remained in possession thereof until his death; that no definite term of lease was ever agreed upon, but that the rent was paid to plaintiff monthly up to and *241including the month of February, 1917. It appears from the receipts offered in evidence that defendant’s intestate paid to plaintiff the rental for said premises up to and including the month of November, 1917.
It appears from the evidence that Allen & Lewis, a corporation, on November 27, 1915, commenced an action against the plaintiff herein in the Circuit Court for Lincoln County, and later recovered judgment in said action; that an execution was issued and the property sold to satisfy said judgment on July 29, 1916; that Allen & Lewis were the purchasers at said sale. It also appears that on February 10, 1917, Allen & Lewis quitclaimed said property to defendant’s intestate, and on December 29, 1918, assigned to him the sheriff’s certificate of sale, and that a sheriff’s deed to said premises was delivered to defendant’s intestate on December 31, 1918.
Plaintiff contends that as defendant’s intestate went into possession of the property as a tenant of the plaintiff and remained in .possession until the time of his death and failed to surrender possession thereof to the plaintiff, defendant is estopped to deny plaintiff’s title notwithstanding that the property was sold under execution to Allen & Lewis, and that the title thereto has passed by mesne conveyances from Allen & Lewis to defendant’s intestate. In support of his contention, plaintiff cites subdivision 5, Section 798, Or. L., which reads as follows: “A tenant is not permitted to deny the title of his landlord at the time of the commencement of the relation.”
Under the statute the tenant is precluded from denying the title of the landlord at the time the relation of landlord and tenant commenced. But he is not estopped, nor does the statute preclude him from *242asserting that the title which the landlord had at the time of the commencement of the relation has since passed, either by the landlord’s own voluntary conveyance of the premises, or by operation of law. A tenant is estopped to deny his landlord’s title “so long as he holds under that title, which is until the landlord is divested of his title by his own act or by operation of law.” Note, 6 Am. St. Rep. 557. See Camp v. Camp, 5 Conn. 291 (13 Am. Dec. 68-72).
In McAusland v. Pundt, 1 Neb. 211 (93 Am. Dec. 358), the court said: “It is well settled that a tenant is not estopped from showing that the interest of the lessor has passed from him by his own conveyance or by sale under judgment against him: Bingham on Real Estate, 210; the tenant himself may become purchaser at such judicial sale: Despard v. Walbridge, 15 N. Y. 377.” In»the same case, the court, in considering the rule of estoppel, said: “This rule, however, must be confined to the title of the landlord or person contracting to sell, had at the time such possession is given. Subsequently to making the lease or contract of sale, the lessor or vendor might sell the premises. In that case, I see nothing to forbid the tenant or vendee in possession from recognizing or treating with him, to whom the vendor or landlord had sold. "What the vendor could himself voluntarily do, the law can as effectually accomplish in cases falling within its authority.”
“It is well settled,” says Mr. Bigelow, “that a tenant in possession cannot, even after the expiration of his lease, deny his landlord’s title without (1) actually and openly surrendering possession to him, or (2) being evicted by title paramount, or attorning thereto, or (3) at least giving notice to his landlord that he shall claim under another and a valid title. ’ ’ *243Bigelow on Estoppel (6 ecL), p. 562. But, says the same author, at page 561, “The tenant, again, may purchase the property from the landlord, and set up the title thus acquired against him. In the case first cited, an action of covenant for rent, the defendant offered to show that he had become the purchaser at execution sale of the reversion of a portion of the demised premises, and the Supreme Court held the evidence admissible in mitigation of damages. And it was said that if the purchase had covered the entire reversionary interest of the landlord, the fact could have been alleged, and would have constituted a perfect bar to the action. Mr. Justice Cowen, speaking for the court, said that the tenant could not deny that the landlord had a right to demise at the time the lease was given; nor could he defend on the ground that he had acquired an outstanding title adverse to that of the landlord. But this was the extent of the doctrine. If the landlord parted with his title pending the lease, the tenant would be bound to pay rent to the assignee; and should the tenant then buy in the assignee’s right, the lease would be extinguished. And the result would be the same if the landlord should sell and release to the lessee. No action would lie for rent in these eases. And, therefore, had there been a sheriff’s sale of the whole reversion, and had the defendant redeemed or purchased under the judgment, no action could have been sustained; for a purchase or acquisition of title under a judgment against the lessor was the same thing as if the lessor had granted by deed.
“But the lessor may transfer his reversion to another, thereby giving to such other the right to the rent as well as to the possession, and the lessee may show, as against a claim for rent or possession by *244the lessor, that the latter, having transferred the reversion, is no longer entitled to assert such claim. Were this not the case, the lessee, or person claiming under him, might be liable to separate suits for possession, or for rent, by both the original lessor and by a transferee of the latter, and be without any defense to either, since, as we have seen, the transferee of the lessor is entitled to the benefit of any rule of preclusion or estoppel to the same extent as the lessor himself.” 1 Tiffany on Landlord and Tenant, p. 493.
“The landlord may not have any interest in the title to the demised premises, but whether he has or not cannot be questioned by the tenant before the expiration of his lease, and whilst in possession under it, unless based upon some distinct and independent claim to the land. Bowdish v. Dubuque, 38 Iowa, 341.” Beck v. Minnesota & Western Grain Co., 131 Iowa, 62 (107 N. W. 1032, 7 L. R. A. (N. S.) 930).
Plaintiff’s contention is that although the plaintiff has lost all title to the premises in controversy, and defendant’s intestate has acquired full and complete title thereto, nevertheless the defendant is now estopped to deny plaintiff’s title for the reason that defendant’s intestate failed to surrender possession of the premises to the plaintiff. This is an action in ejectment, and if plaintiff recovers at all he must recover on the strength of his own title and not, on the weakness of his adversary’s title. But regardless of this, there is no merit in plaintiff’s contention. The law does not prohibit a tenant from acquiring title to the demised premises, either by voluntary conveyance or judicial sale, and there is no more reason for holding that the tenant should be required to *245surrender possession before asserting bis own title in the one case than in the other. Where real property in the, possession of a tenant is conveyed by a landlord to a third party, the tenant, unless his lease so provides, is not required to surrender possession of the demised premises to the original landlord, but he may remain in possession under the lease upon paying the rental to the new landlord. The same rule applies where the title to the property of the landlord has become vested in a third party by judicial sale. So if the tenant himself, instead of a third party, acquires the title to the property which his landlord had at the time of the demise, whether he acquires the same by voluntary conveyance from the landlord or by purchase at execution sale, the tenant is not required to surrender the possession of the demised premises to his former landlord before becoming entitled to claim the property as his own. When, under a voluntary conveyance from his landlord or by operation of law, a tenant has acquired his landlord’s title to the demised premises, the relation previously existing between them of necessity is terminated at once and the lease is at an end. Upon the tenant’s acquisition of the title that his landlord had at the time of the demise, the rights of the former landlord against the tenant are extinguished, and the duties of the tenant to the landlord are discharged. By such acquisition of title the lesser estate of the tenant in the property has become merged in the greater estate acquired by the tenant when he became the owner of the land.
A tenant is estopped to deny the title that the landlord had to the premises at the time of the demise, whether such title was at the time a good or a defective title, and this estoppel continues in force as long *246as the tenant remains in possession of the demised premises under the lease or holds under that title, but when the landlord is divested of his title by his own act or by operation of law, the estoppel is at an end, and if the tenant himself acquires the title that the landlord had at the commencement of the relation, he is neither estopped to deny the landlord’s title nor does the law compel him to surrender possession of the premises before claiming title thereto in himself.
Finding no error in' the record, the judgment of the lower court will be affirmed, and it is so ordered.
Affirmed. Rehearing Denied.
Burnett, C. J., and McBride and Harris, JJ., concur.