Apostolic missionary in the fight against heresy

Peter Rosini was born in Verona around 1205 into a well-to-do family. It is possible that some of his relatives had embraced the Cathar heresy, which was widespread at the time. His father sent him to study at the University of Bologna, where he came into contact with the environment of the Domenican Friars of the Order of Preachers. He personally met Saint Dominic, who, in 1221, admitted him into his Order.