ALZOG, JOHANN BAPTIST (1808-78), German the ologian, was born at Ohlau, in Silesia, June 29 1808. Together with Dollinger, Alzog was instrumental in convoking the famous Munich assembly of Catholic scholars in 1863. He also took part, with Bishops Hefele and Haseberg, in the preparatory work of the Vatican Council, and voted in favour of the doctrine of papal infallibility but against the opportuneness of its promul gation, Alzog's fame rests mainly on his Handbuch der Universal Kirchengeschiclite (Mainz, 1841, often reprinted under various titles; Eng. trans. by Pabisch and Byrne, A Manual of Church History, Cincinnati, 1874). Alzog was an active collaborator in the great Kirchenlexicon of Wetzer and Welte and was also the author of Grundriss der Patrologie (Freiburg, 1866, 4th ed. 1888), a scholarly work, though since superseded.
A full list of Alzog's writings is given in H. Hurter's Nomenclator literarius recentioris theologiae catholicae, vol. iii. For an account of his life see the funeral oration by F. X. Kraus, entitled Geddchtnissrede auf Johannes Alzog (Freiburg, 1879).