Petronilla of Aragon

Petronilla (1136–1173), queen of Aragon, was the only child of King Ramiro II and Agnes of Aquitaine. Her father had taken the throne after his brother Alfonso I died childless in 1134, leaving his kingdom to military orders.

In August 1137, when little over a year old, she was betrothed at Barbastro to Count Ramon Berenguer IV of Barcelona, joining Aragon and the County of Barcelona into the Crown of Aragon.

After her husband died in 1162 and she abdicated in 1164, she ruled as regent for her young son Alfonso II until her death, and was the last ruler of Aragon's Jiménez dynasty.