Constance of Aragon was an Aragonese infanta who was by marriage firstly Queen of Hungary, and secondly Queen of Germany and Sicily and Holy Roman Empress. She was regent of Sicily from 1212 to 1220.

Alfonso II, called the Chaste or the Troubadour, was the King of Aragon and, as Alfons I, the Count of Barcelona from 1164 until his death. The eldest son of Count Ramon Berenguer IV of Barcelona and Queen Petronilla of Aragon, he was the first King of Aragon who was also Count of Barcelona. He was also Count of Provence, which he secured from Douce II and her would-be father-in-law Raymond V, Count of Toulouse, from 1166 until 1173, when he ceded it to his brother, Ramon Berenguer III. His reign has been characterised by nationalistic and nostalgic Catalan historians as l'engrandiment occitànic or "the Pyrenean unity": a great scheme to unite various lands on both sides of the Pyrenees under the rule of the House of Barcelona.