Leo was disturbed throughout his pontificate by heresy and schism.
This theory has advanced from the position of a disparaged heresy to acceptance by leading thinkers.
Soon after his arrival, Ignatius may have seen in the Place de Greve the burning of Louis de Berquin for heresy.'
During the absence of the pope, a certain hermit began to spread heresy and was opposed by Ignatius and his companions.
An investigation was begun in March 1559, and as the result of a conviction for heresy the exhumed body of Jorisz was burned, together with his portrait, on the 13th of May 1559.