County of Barcelona
The Jewish families assisted the Christian administrations of the Kingdom of Aragon and the County of Barcelona as tax collectors and advisers. In 1150 Aragon and Barcelona were united by the marriage of their rulers. The Jewish families appear together with the name Benveniste in official and Jewish documents of Narbonne, Barcelona and Aragon from the 11th-13th century AD with the title Nasi added to their names. They appear in the travel books of Benjamin of Tudela from the 12th century.