The monastery of San Pedro de Galligans is a former Benedictine abbey.

The construction of the monastery began outside the walls, when Ramón Borrell sold (in 992) to the abbot the domain over the Sant Pere neighborhood.

The following year, the monastery received a significant donation from the count's will. The control of the abbots over the neighborhood ended in 1339 when Pedro III recovered the royal rights.

In the year 1117, Ramón Berenguer III joined Sant Pere with the French monastery of La Grassa del Llenuadoc, although he continued to have his own abbot. Although the union continued, a century later it was merely nominal.

It was never a great abbey. The community consisted of the abbot, six monks, and six clergymen. Although it was the parish of the Sant Pere neighborhood, the nearby church of Sant Nicolás performed these functions. Only baptisms took place in Sant Pere.

From the 15th century the activity of the monastery began to decline. In 1592 it was joined to the monasteries of Sant Miquel de Cruïlles and Sant Miquel de Fluvià, which were also in decline. The union did not serve to increase monastic activity in any of the three monasteries.

Sant Pere had an abbot and four monks in 1835, the date on which his exclaustration took place.

The church was built in 1130. It is a building with three naves with a transept and four apses, one in the central nave, two in the area of the epistle and the other under the bell tower. The portal is somewhat archaic, which suggests that it corresponds to a building of previous construction.