Ramon Berenguer campaigned against the Moors, extending his dominions as far west as Barbastro and imposing heavy tributes (parias) on other Moorish cities.

Ramon Berenguer the Old was also the first count of Catalonia to acquire lands (the counties of Carcassonne and Razés) and influence north of the Pyrenees.

Legal codification was part of the count's efforts to forward and somehow control the process of feudalization which started during the reign of his weak father, Berenguer Ramon.

The earliest extant date for introducing the Truce of God in Western Europe is 1027 in Catalonia, during the reign of his father, Berenguer Ramon.

[3][4] Ramon Berenguer I, together with his third wife Almodis, also founded the Romanesque cathedral of Barcelona, to replace the older basilica presumably destroyed by Almanzor.