Ervin, J.

A person wbo undertakes to exercise the functions of a judicial office on a particular occasion may be a judge de jure, or a judge de facto, or a mere intruder.

Since he is exercising the office of a judge as a matter of right, a judge de jure meets this three-fold test: (1) He possesses the legal qualifications for the judicial office in question; (2) he has been lawfully chosen to such office; and (3) he has qualified himself to perform the duties of such office according to the mode prescribed by law. These things being true, he has a complete title to his office; his official acts are valid; and he cannot be ousted. Norfleet v. Staton, 73 N.C. 546, 21 Am. R. 479.

A judge de facto may be defined as one who occupies a judicial office under some color of right, and for the time being performs its duties with public acquiescence, though having no right in fact. Cooley: Constitutional Limitations (8th Ed.), Vol. 2, page 1355. A person will be deemed to be a de facto judge when, and only when, these four conditions concur: (1) He assumes to be the judge of a court which is established by law; (2) he is in possession of the judicial office in question, and is discharging its duties; (3) his incumbency of the judicial office is illegal in some respect; and (4) he has at least a fair color of right or title to the judicial office, or has acted as its occupant for so long a time and under such circumstances of reputation or acquiescence by the public generally as are calculated to afford a presumption of his right to act and to induce people, without inquiry, to submit to or invoke official action on his part on the supposition that he is the judge he assumes to be. For all practical purposes, a judge de facto is a judge de jure as to all parties other than the State itself. His right or title to his office cannot be impeached in a habeas corpus proceeding or in any other collateral way. It cannot be questioned except in a direct proceeding brought against him for that purpose “by the Attorney-General in the name of the State, upon his own information or upon the complaint of a private person,” pursuant to the statutes embodied in Article 41 of Chapter 1 of the General Statutes. So far as the public and third persons are concerned, a judge de facto is competent to do whatever may be done by a judge de jure. In consequence, acts done by a judge de facto in the discharge of the duties of his judicial office are as effectual so far as the rights of third persons or the public are concerned as if he were a judge de jure. The principles enunciated in this paragraph arose at common law, and have been accorded full recognition in this State. S. v. Harden, 177 N.C. 580, 98 S.E. 782; S. v. Shuford, 128 N.C. 588, 38 S.E. 808; *564 S. v. Turner, 119 N.C. 841, 25 S.E. 810; Hughes v. Long, 119 N.C. 52, 25 S.E. 743; Van Amringe v. Taylor, 108 N.C. 196, 12 S.E. 1005, 23 Am. S. R. 51, 12 L.R.A. 202; S. v. Lewis, 107 N.C. 967, 12 S.E. 457, 13 S.E. 247, 11 L.R.A. 100; S. v. Speaks, 95 N.C. 689; Norfleet v. Staton, supra; Ellis v. Institution, 68 N.C. 423; Culver v. Eggers, 63 N.C. 630; Swindell v. Warden, 52 N.C. 575; Commissioners v. McDaniel, 52 N.C. 107; Burton v. Patton, 47 N.C. 124, 62 Am. D. 194; Gilliam v. Reddick, 26 N.C. 368; Burke v. Elliott, 26 N.C. 355, 42 Am. D. 142.

Moreover, the Legislature has conferred express approval upon the de facto doctrine in the case of persons actually inducted into office in the manner prescribed by law. A statute, which had its genesis in Chapter 38 of the Laws of 1844 and is now codified as Gr.S. 128-6, provides that “any person who shall, by the proper authority, be admitted and sworn into any office, shall be held, deemed, and taken, by force of such admission, to be rightfully in such office until, by judicial sentence, upon a proper proceeding, he shall be ousted therefrom, or his admission thereto be, in due course of law, declared void.”

A usurper is one who undertakes to act officially without any actual or apparent authority. Since he is not an officer at all or for any purpose, his acts are absolutely void, and can be impeached at any time in any proceeding. S. v. Shuford, supra; Van Amringe v. Taylor, supra; Norfleet v. Staton, supra; Keeler v. New Bern, 61 N.C. 505.

Practical procedural rules have been devised to enforce these principles in actual litigation. Where the validity of an act of a person acting in a judicial office on a particular occasion is assailed in a collateral proceeding before another court on the theory that he had no right to the office, the court may inquire into his title to the judicial office far enough to determine whether he was a judge de jure, or a judge de facto, or a mere usurper at the time he performed the act in question. If such inquiry reveals that he was at least a judge de facto at that time, the court can proceed no further in its investigation of the title to the office; for the official act of a judge de facto is as binding as that of a judge de jure. U. S. v. Alexander, 46 F. 728.

When these legal principles are laid alongside the record in this proceeding, it is immediately evident that Mayor McNeil did not act as a mere usurper in trying the petitioner and committing her to jail. He was undoubtedly a judge de jure from the time of his qualification as Mayor until 7 June, 1949. As the Town Commissioners did not appoint anyone to succeed him in the judgeship of the Special Oo.urt under Chapter 1142 of the 1949 Session Laws, a cogent argument might be advanced to sustain the proposition that he has remained a judge de jure since 7 June, 1949, under G.S. 128-7, which stipulates that “all officers shall continue in their respective offices until their successors are elected *565 or appointed, and duly qualified.” Markham v. Simpson, 175 N.C. 135, 95 S.E. 106.

Be tbis as it may, it cannot be gainsaid that Mayor McNeil was at least a judge de facto when he took the official action resulting in this proceeding. Since Section 29 of Article II forbidding the passage of “any local, private, or special act or resolution relating to the establishment of courts inferior to the Superior Court” did not become a part of the Constitution of North Carolina until it was adopted by the qualified voters of the State in the general election in 1916, the General Assembly of 1913 acted within constitutional limits in creating the Special Court of the Town of North Wilkesboro by private act. N. C. Const., Art. IV, Sections 2, 12. This being true, the record makes it plain that Mayor McNeil assumed the judgeship of a court established by law; that he actually occupied the judgeship and discharged its duties; and that he had at least a fair color of right or title to such judgeship under Chapter 141 of the Private Laws of 1913 and G.S. 128-7 by virtue of his election and qualification as Mayor. Hence, he was a judge de facto under common law principles when he tried the petitioner and sent her to jail. This conclusion is valid even if it be taken for granted that on its effective date, i.e., 7 June, 1949, Chapter 1142 of the 1949 Session Laws caused Mayor McNeil’s term as judge of the Special Court to expire, made the mayoralty and the judgeship incompatible offices, and rendered Mayor McNeil ineligible for the judgeship. Where the requisite conditions exist, a person is a judge de facto although he holds over after his term has expired, Threadgill v. Railroad, 73 N.C. 178; Cary v. State, 76 Ala. 78; Territory v. Mattoon, 21 Hawaii 672; Feck v. Commonwealth, 264 Ky. 556, 95 S.E. 2d 25; Sheehan’s Case, 122 Mass. 445, 23 Am. Rep. 374; Windom v. City of Duluth, 137 Minn. 154, 162 N.W. 1075; Carli v. Rhener, 27 Minn. 296, 7 N.W. 139; Youmans v. Hanna, 35 N.D. 479, 161 N.W. 797, Ann. Cas. 1917 E, 263; Cromer v. Boinest, 27 S.C. 436, 3 S.E. 849; or although he holds incompatible offices, Sheehan’s Case, supra; Woodside v. Wagg, 71 Me. 207; Marta v. State (Tex. Cr.), 193 S.W. 323; or although he is ineligible for the office, In re Russell, 60 N.C. 388; In re Danford, 157 Cal. 425, 108 Pac. 322; Sheehan’s Case, supra; Blackburn v. State, 40 Tenn. 690.

The act of Mayor McNeil in trying the petitioner and committing her to jail was also immune to collateral attack under G.S. 128-6. He had been admitted and sworn into his dual office as Mayor and Judge by the proper authority, and should have been “held, deemed, and taken, by force of such admission,” to have been rightfully in his office when he acted as judge in the petitioner’s case.

The de facto doctrine is indispensable to the prompt and proper dispatch of governmental affairs. Endless confusion and expense would *566 ensue if tbe members df society were required to determine at tbeir peril tbe rightful authority of each person occupying a public office before they invoked or yielded to his official action. An intolerable burden would be placed upon the incumbent of a public office if he were compelled to prove his title to his office to all those having occasion to deal with him in his official capacity. The administration of justice would be an impossible task if every litigant were privileged to question the lawful authority of a judge engaged in the full exercise of the functions of his judicial office.

The acts of Mayor McNeil were effectual in law; for he was at least a judge de facto when they were performed. This being so, it was error to permit the collateral attack upon his title to the judgeship, and to sustain such attack on the theory that he acted without authority. The judgment discharging the petitioner from custody is

Reversed.