St. Augustine's Monastery in Erfurt, central Germany, is a former church and friary complex dating from the 13th century. The site is almost one hectare in size. It was built by Augustinian friars, an order of the Catholic Church. It is most well known as the former home of Martin Luther (1483–1546), the father of the Reformation, who lived there as a friar from 1505 until 1511.