Zacharias Ursinus (1534-1583), a sixteenth century German theologian, born Zacharias Baer in Breslau (now Wrocław, Poland). Like all young scholars of that era he gave himself a Latin name from ursus, meaning bear. He is best known as a professor of theology at the University of Heidelberg and co-author with Caspar Olevianus (1536-1587) of the Heidelberg Catechism. His Works were published in 1587-1589, and a more complete edition by his son and two of his pupils, Pareus and Reuterus, in 1612.