From 27 June to 16 July 1519, the theologian Johann Eck of Ingolstadt debated Andreas Karlstadt and Martin Luther of Wittenberg in the ducal palace in Leipzig. The question was the authority of the pope and the church. Every word, spoken in Latin, was taken down by recorders. Eck had himself celebrated as the winner. The church historian Armin Kohnle sees no clear winner. In the debate, Luther conceded that not all the teachings of Jan Hus, who had been burned as a heretic, were heretical.