The queen gave the monastery a series of privileges, including the direct protection of the city of Barcelona, through the Consell de Cent ("Council of the Hundred"), who had the task to defend it in case of danger.
Originally, the monastery (built in white stone, pedres albes in Catalan, hence its name) was defended by a line of walls, of which today only two towers and one gate remain.
The church has a single nave, with rib vaults and a polygonal apse, and houses a Gothic retablo by Jaume Huguet.
It is formed by wide arches on columns, whose capitals are decorated with the emblems of the Kings of Aragon and the House of Montcada.
Now these are in the Museu Nacional d'Art de Catalunya in Barcelona, or the main Madrid home of the collection.