Pope Martin IV (Latin: Martinus IV; born Simon de Brion; c. 1210 – 28 March 1285), was the head of the Catholic Church and ruler of the Papal States from 22 February 1281 until his death on 22 March 1285. He was the last French pope to hold his court in Rome before the papacy moved to Avignon.
Before his election, Simon de Brion was a prominent French cleric who served as chancellor to Louis IX of France and was made a cardinal by Pope Urban IV in 1261.