Ermessenda or Ermesinda from Carcassonne ruled the territories of the Barcelona, Girona and Osona counties and was the tutor of her son Berenguer Ramon I and her grandson Ramon Berenguer I when this two were minors. Daughter of Roger I, count of Carcassonne, she got married in 922 with Ramon Borrell, son of the count of Barcelona. She was known because of her beauty and her energetic character. She was many time at the Barcelona’s court, surrounded by judges and managing  justice in the presence of her vassals, with or without her husband, and accompanying him to war and to his military expeditions. He made it up by giving her properties as big castles and fortresses in the counties of Barcelona, Osona and Manresa, what gave her a big politic and economic power. 

During her government the aristocracy initiated the process of feudalization of the Hispanic Marca, facing the princes against the church. Ermessenda was supported by counselors such as the abbot of Ripoll, the bishop of Girona and Abat Oliba. She took care of the church and encouraged new foundations, such as the Cathedral of Girona, the feminine monastery of Sant Daniel and the masculine one in Sant Feliu de Guixols. He transferred the count's rights to her grandsons of the county of Barcelona and several castles in exchange for a thousand ounces of gold, which he invested in the tabernacle factory of the Cathedral of Girona, of which she was very devoted and cooperative. When she died, she was buried inside it.