Constance of Sicily was a 13th-century queen who held titles in both Aragon and Sicily. Born in Catania to King Manfred, she married Peter III of Aragon in 1262. Following her father's death, she maintained a claim to the Sicilian throne, which she eventually ruled alongside her husband from 1282 until 1285. After the passing of her husband, she entered the religious life, joining the Poor Clares. She died in Barcelona in 1302 and is recognized as a blessed in the Catholic tradition.