Jan Hus (or John Huss) (1372-1415) was a preacher in Prague who picked up on the ideas of John Wyclif (or Wycliffe) (1330-1384) and spread them in central Europe. Born in southern Bohemia, Hus harshly criticized immorality in the clergy and preached a doctrine concerning the Eucharist that was considered to be heretical. He was excommunicated in 1411. A Council of Constance was convened under an "antipope" (not the official pope), and this Council tried Hus in 1414 and burned him at the stake, making him a martyr. His followers, known as Hussites, fought battles against the Holy Roman Empire with surprising success.