Guy of Boulogne

Guy of Boulogne (1313–1373) was the third son of Count Robert VII of Auvergne and Boulogne. Destined for the Church, he studied theology and was elected Archbishop of Lyon in 1340. Pope Clement VI made him a cardinal in 1342, and he left Lyon for Avignon.

As a papal legate he negotiated truces in Hungary, Italy and Spain and headed efforts to end the Hundred Years' War; his niece Joan married the future John II of France. He later became cardinal-bishop of Porto and dean of the College of Cardinals, and helped choose Popes Urban V and Gregory XI.

He died at Lleida in 1373 on a diplomatic mission, probably poisoned, though the suspicion cast on Charles II of Navarre was later cleared. Petrarch's letters mention him often.