The agreement to create the Priorat Regional Archive (ACPR) was signed on 22 September 2000 and was inaugurated on 27 July 2005.

The Archive is located in one of the buildings that form part of the castle in the town of Falset. Construction of the castle began at the end of the 12th century, on a small hill located to the west of the town. The same space housed, for many years, the heritage archive of the Catalan territories of the Duchy of Medinaceli.

The most significant documentary collections of the archive are, among others: those of the town councils of Falset and Capçanes; the microfilmed collections of the barony of Entença and the county of Prades; that of the Roger de Cabacés farmhouse, and that of Joan Pascó i Ardèvol, notary of Porrera and, later, of Falset, which has a good part of the notarial drafts, from the end of the 18th century to the first third of the 19th century, which partly replace the loss of the district's notarial archive in 1936. It is worth noting the large number of funds from agricultural cooperatives in the region that have been deposited there; specifically, ten, and the oldest is the Sindicat Vinícola del Baix Priorat de Marçà, created in 1912.