OEcolampadius, really John Hausschein or Heussgen, the German patronymic being classicised, was born at Weinsberg, in Wurtemberg, in 1482. Trained at Heidelberg, he became a pastor at Basle in 1515, and at once joined the party of reform. In 1518 he was transferred to Augsburg, and was for a while a monk, but four years later went back to Basle, where he openly preached the new doctrine, following Zwingli rather than Luther. He died in 1531. He was the author of a Greek grammar, commentaries on the prophets and Genesis, and a treatise, De Ritu Paschali.