Pope Gregory X
Around this time he was chosen bishop of his native city, but he declined the office. For a time, he devoted himself to preaching the Eighth Crusade; and later, at the request of Pope Gregory X, caused the studies which the late wars had practically suspended to be resumed in the Dominican convent at Rome. After the death of Pope Gregory X, he retired to one of the convents of his order, whence he was summoned by Innocent V and sent as papal legate to Tuscany. He restored peace there between Florence and Pisa and also between the dogal republics of Venice and Genoa, another pair of commercial rivals within Italy.