William II called Trunus or el Tro, was the Count of Besalú from 1052.

He was the son and successor of William I and Adelaide. He married Stephanie, daughter of Geoffrey I of Provence

Geoffrey I of Provence

Geoffrey I or Josfred was the joint Count of Provence with his elder brothers William IV and Fulk from 1018 to his death. He was the third son of William II of Provence and Gerberga of Mâcon and a scion of the younger line of the family...

. He had a son Bernard II and a daughter, Stephanie, who married Roger II of Foix.

His reign was characterised by conflict with the church. He had to cede Bàscara

Bàscara

Bàscara is a municipality in the comarca of Alt Empordà, Girona, Catalonia, Spain....

 to the bishopric of Girona

Girona

Girona is a city in the northeast of Catalonia, Spain at the confluence of the rivers Ter, Onyar, Galligants and Güell, with an official population of 96,236 in January 2009. It is the capital of the province of the same name and of the comarca of the Gironès...

. He associated his brother Bernard II

Bernard II of Besalú

Bernard II was the Count of Besalú and Ripoll in Catalonia, the brother, co-ruler , and successor of William II, who was assassinated in 1066. The second son of William I of Besalú and his wife, Adelaide, Bernard married his first cousin Ermengarda, daughter of Ponç I of Empúries and Adelaide,...

, later his successor, with him as co-count.