A Canon Regular of the Lateran, he later converted to Protestantism, taking refuge in Strasbourg, where he was appointed professor of Greek.
When Peter was elected prior of San Frediano monastery in 1541 he set up a college based on humanist principles of education, with Lazise employed as a teacher of Latin.
Among his colleagues there were Celso Martinengo [it], a professor of Greek and Immanuel Tremellius, a Jewish convert to Christianity who taught Hebrew.
[2] Lazise also worked as a private tutor, but he continued his preaching efforts and collaborated with Francesco Robortello, a professor at the University of Lucca, in the preparation of a commentary on the Poetics of Aristotle.
In July 1542, Cardinal Bartolomeo Guidiccioni, Inquisitor of the Holy Office, denounced the government of Lucca and Curione and teachers of the school of San Frediano as heretical and subversive of the Republic.