Gavín (Aragonese: Gabín)[1] is a Spanish locality situated in the municipality of Biescas.

The building has a nave finished off by an apse, a bell tower with Horseshoe arched windows.

[5] The Monastery of Saint Pelagius also forms part of the Serrablo churches, it uses early-Romanesque and Mozarabic design.

The excavations conducted found that the monastery had two adjacent churches, a tower, a dormitory and other monastic buildings.

The monastery is located on the left bank of the River Sia a few kilometres away from Gavín.