The church of San Miguel is a late Romanesque and Proto-Gothic church of Catholic worship, located on the banks of the river Carrión. The most characteristic feature of the building is its tower with large openwork windows and battlements that give it the appearance of a fortress, making it one of the emblematic images of the city. It was declared a Historic-Artistic Monument in 1931, and an Asset of Cultural Interest in 1992.

Following legendary tradition, it is said that the Castilian hero Rodrigo Díaz de Vivar, the Cid Campeador, and his wife Doña Jimena were married in this church, although there is no historical confirmation of this fact.

On the other hand, for centuries it was the southern limit of the city of Palencia, being one of the main parishes of the city. As a consequence of the Lisbon earthquake in 1755, the tower had to be reinforced due to the risk of collapse. The tower was going to be higher, but due to the constant invasions and looting that Palencia suffered, it was decided to use what were going to be the window openings of the upper part as battlements and to use them as guard towers.

Two very popular celebrations take place in the area around this church: The Baptism of the Child, which is held on 1st January and is a festival of Regional Tourist Interest, and the traditional blessing of the animals on Saint Anton's Day.

We now turn to the analysis of its structure, which is oriented towards the river and has a quadrangular section. In the lower part of the structure, a late Romanesque doorway with a semicircular arch, furrowed by worn but beautiful archivolts, provides access to the interior of the church. Two buttresses climb up the wall to the middle of the tower, framing a large window with a Gothic design.

Further up, there are two slightly pointed embrasures, and further up, in a body separated by an impost, a window with fine mullions with an openwork tracery at the top; the same motif is repeated on each of the faces of the tower, although with variations, as while those facing south, east and north have a mullion that divides the opening in two, the one on the west has two mullions and a tracery with a more complex design. To finish off, a moulding decorated with canons decorates the end of the cornice, below the characteristic battlements that give it its medieval appearance.

On the north side of the tower there is a dodecagonal turret, also crenellated, which serves as an access spindle to the belfry and the upper terrace.