The church of San Pedro is a Catholic temple that formed part of the convent of San Francisco de Lugo, which belonged to the Franciscan Order. In the opinion of some authors, it is the synthesis of Franciscan and Dominican architecture in Galicia.

According to tradition, the convent of San Francisco de Lugo was founded by Saint Francis of Assisi himself in 1214, during his hypothetical pilgrimage to Santiago de Compostela.

The church of San Pedro has a Latin cross floor plan, and its transept, covered by a hipped roof resting on a wooden structure supported by four toral arches, stands out both in height and length, and has a single bay in each arm, and five bays in the nave.

The main chapel is located at the foot of the church and on its western side, and there are two square buttresses that frame it and restrain the thrust of the nave of the church and of the doorway itself, which is made of granite ashlars that end in a gabled pinion crowned by a cross. In the central body there is a large window, and in the lower body is the door, which allows access to the church. Next to the doorway is the tower, which is on the right, and the chapel of the Venerable Third Order, which is on the left and whose doorway is at the same level as the main façade of the church. Count Pedro Enríquez de Castilla stipulated in his will that his corpse should be buried in this chapel, and she should be given a solemn and honourable burial.

In the 1970s, during restoration work on the church, a small hexagonal crypt of small dimensions was discovered which, according to some authors, must have served to temporarily house the remains of those who were later buried in the main chapel.

The chapel on the Gospel side is shaped like a pentagon, and its access arch is made up of a pointed and bent arch with a rectangular section. And in the chapel, which is covered by a sexpartite vault resting on two arches that are joined at the keystone, there are two pointed Gothic windows located in the third and fourth wall panels. This chapel was linked to the Bolaño family, which has two tombs there of two members of their lineage, one of them corresponding to Pedro Fernández de Bolaño and the other to his brother, Rodrigo Alfonso de Saavedra.

The chapel on the Epistle side is almost identical to the chapel on the Gospel side, as its floor plan is in the shape of a pentagon and its access arch is made up of a pointed and bent arch with a rectangular section. And in the chapel, which is covered by a sexpartite vault resting on two arches that join at the keystone, there are two pointed Gothic windows located in the third and fourth wall sections. In the fourth and fifth mural section there are two arches identical to those in the chapel on the Gospel side, although in this one only one of them is occupied by a tomb with a recumbent statue, which is the one that most historians attribute to Count Pedro Enríquez.