CARNESECCHI, PIETRO (I 508-1567), Italian humanist, was the son of a Florentine merchant, who enjoyed the patronage of the Medici. At the age of 25 he held several rich livings, had been notary and protonotary to the Curia, and was first secretary to the pope. He accepted Luther's doctrine of justification by faith, though he repudiated a policy of schism. When the move ment of suppression began, Carnesecchi found shelter with his friends in Paris. On the accession of Pius IV. (1559) he came to live in Rome. With the accession of Pius V. in 1565 the In quisition renewed its activities, and Carnesecchi betook himself to Florence, where he was betrayed by Cosimo, the duke, who wished to curry favour with the pope. He was beheaded and then burnt on Oct. 1, 1567.