County of the Spanish March, named after a town in the northeastern corner of Spain, northwest of Gerona, on the River Fluvia as it emerges from the Pyrenees.
Besalú was held by a branch of the family of the Counts of Barcelona. In 1107 the Count was persuaded by the Count of Barcelona to marry his daughter on condition that if there were no children, Besalú would become part of Barcelona.
As the Count was aged and his bride was still a child, the arrangement seems one-sided, but perhaps he calculated that any child born to him at his age would need the protection of some mighty lord, and so he gave his County a tiny chance to survive. As it turned out, the Count died childless and the County became part of Barcelona in 1111.