In 1329 John XXII sent him to King Charles I of Hungary and to Ban Stephen II of Bosnia for the purpose of bringing about the extermination of the heretics, largely Patarenes, in these countries. On 5 September 1333, Gerardus and the Dominican Arnauld de Saint-Michel (Arnauldus de S. Michaele) were appointed papal legates to make peace between the Kings of England and Scotland. The procurator of the Scottish king in Paris having reported, however, that his master was not to be found in Scotland, John recalled the commission of the legates, 31 October 1333.