Soria pro-Cathedral was built in the 12th century on the site of an old Augustine monastery, and was subsequently rebuilt in the 16th century in Renaissance style under the patronage of Bishop Acosta. The church has an open plan with three naves of equal heights, covered by vaults with star-shaped skylights. It has quite austere décor, both inside and out, except the south doorway, which is in Plateresque style, with a round arch with archivolts and a high frieze. It still conserves its 12th century Romanesque cloister.