Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Raymond Berengar IV or Ramon Berenguer IV (c. 1113 6 August 1162), sometimes called the Holy, was the Count of Barcelona who effected the union between the Kingdom of Aragon and the Principality of Catalonia into the Crown of Aragon.He inherited the county of Barcelona from his father Ramon Berenguer III on August 19, 1131. On August 11, 1137 in Huesca he was betrothed to the infant Petronila of Aragon, aged one at the time. Her father, Ramiro II of Aragon the Monk, who sought Barcelona''s aid against Alfonso VII of Castile, abdicated on November 13 that same year, leaving his kingdom to Petronilla and Ramon Berenguer. The latter essentially became ruler of Aragon, although he was never king himself, but instead Count of Barcelona, Prince of the Kingdom of Aragon. He was the last Catalan ruler to use the title of Count as his first; starting with his sonAlfonso II of Aragon the counts of Barcelona styled themselves, in the first place, as kings of Aragon.