Mencke, Otto a learned German divine, was born at Oldenburg, in Westphalia, in 1644. When a youth of seventeen, he left the parental roof to seek further educational advantages than his native place could afford him at the large harbor of Bremen, and there he pursued the study of philosophy; he next removed to the University of Leipsic, where he was admitted master of arts in 1664. Thereafter he continued his studies at the universities of Jena, Wittemberg, Groningen, Franeker, Utrecht, Leyden, and Kiel. Returning to Leipsic, he applied himself for some time to divinity and civil law. In 1668 he was chosen professor of morality in that university, and in 1671 took the degree of licentiate in divinity. He discharged the duties of his professorship with great reputation till his death, which happened in 1707. He was five times rector of the University of Leipsic, and seven times dean of the faculty of philosophy. He published several works of his own, and edited many valuable productions of others. They are all, however, of a secular character. See Genesis Biog Dict. s.v.; Biographie Universelle, s;v.