House of Aragon

The (Royal) House of Aragon is the name given to several royal houses that ruled the County, the Kingdom or the Crown of Aragon.

Some historians use the term for the house that started with Ramiro I, a member of the Jiménez dynasty who established the autonomous county of Aragon that would become the Kingdom of Aragon. Later Petronila of Aragon would marry the Count of Barcelona Ramon Berenguer IV, Count of Barcelona to create the Crown of Aragon.

The end of this dynasty is variously given. Some historians consider that the House of Aragón was extinguished when Ramiro II of Aragon died without male descent, and that later holders of this crown should be called members of the House of Barcelona, . However, the marriage provisions of his daughter Petronila say that her husband was never the king of Aragon, and their descendants call themselves in the following centuries "de Aragon", and are known as such in other countries.

A separate branch of the latter house governed the Kingdom of Sicily from the crowning of Frederick III of Sicily in 1285 until the death of Martin the Younger in 1407 without descendents, with the kingdom returning then to the main branch. Another separate branch reigned from the crowning of the bastard Ferdinand I of Naples in 1458 to the death of Frederick IV of Naples in 1504. This part of the house is sometimes called "House of Aragon and Sicily".