The interior of the Church of Our Lady of the Snows in Prague. On 25 February 1419 King Vaclav IV allowed followers of Jan Hus, who had been burned at the stake in 1415 as a heretic, to hold services, preach, sing Czech hymns and give out both items of communinion - the chalice and bread - to parishioners. Thereafter the Church became the centre for the most radical Hussites where Jan Zelivsky established himself as a preacher.
Jan Hus (or John Huss, 1369 - 1415) was a Czech priest, philosopher and one of the first church reformers. Hus attacked moral failings among the clergy and promoted some of the teachings of John Wycliffe (1331 - 1384), an English reformere who had been burned at the stake in 1384. Hus was excommunicated for his views in 1410 and burned at the stake as a heretic in Konstanz on 6 July 1415.