Aragon was originally a Carolingian feudal county around the city of Jaca, which in the first half of the 9th century became a vassal state of the kingdom of Pamplona (later Navarra), its own dynasty of counts ending without male heir in 922. The name Aragón is the same of the river Aragón, which flows by Jaca. It might derive from the Basque "Aragoi" meaning "high valley". Raymond Berenguer V of Barcelona, the new ruler of the united dynasty, still called himself Count of Barcelona and merely "Prince" of Aragon.