Petronilla of Aragon (born 1135)

Petronilla, whose name is also spelled Petronila or Petronella, was Queen of Aragon (1137–1164) from the abdication of her father, Ramiro II, in 1137 until her own abdication in 1164. After her abdication she acted as regent during the minority of her son Alfonso II of Aragon (1164–1173). She was the last ruling member of the Jiménez dynasty in the Kingdom of Aragon, and by marriage to Ramon Berenguer IV, Count of Barcelona brought the House of Barcelona to the throne of Aragon, uniting the Kingdom of Aragon with the County of Barcelona to create the Crown of Aragon.