It is built under the base of another previous hermitage.
Exterior
The church of San Severino, whose name recalls the old Jacobean road of Bizkaia, dates from the fifteenth century (Gothic church), although you can find some baroque additions, such as pinnacles and archangels.
The main cover (next to City Hall) is very simple; it only has five pointed archivolts that do not have decoration and rose window in the upper part.
The lateral cover presents / displays an arc of entrance pointed between 2 abutments with five archivolts of which only two are decorated. Under these is a large tympanum and mullion with the image of the Savior (San Severino: Jacobean Vocation).
The tower and the bell tower, much more decorated and ornamented, are of Baroque style although built on a previous Gothic basement. It is the newest part of the church (18th century - 1726).
The temple was restored at the beginning of the 18th century, due to its dilapidated condition.
Inside
The church is divided into three naves: a higher central and two lateral naves, which in turn are divided into four sections separated by 6 columns. The central nave ends in the apse that is the altar, which contains impressive stained glass windows from the 19th century. In the back part of the church is the choir with a Cavaille - Coll organ from the 19th century (1892).
The roofs are made with ribbed vaults, the roofs of the lateral aisles being of simple ribbing, and those of the central nave with a complex ribbing.
To this church, and in its primitive plant, lateral chapels were added, financed by the best families of the Villa.
The most interesting of the three is that of the Urrutia family: chapel of the sixteenth century (gothic - late), which presents an altarpiece with a calvary, being very interesting its ribbed vault with an eight-pointed star shape and with vegetal decoration in its interior. It was the work of Juan de Rasines and is dated in 1545, as indicated by the inscription on the wall.
The church has 5 tombs. The ones in the front right are from the Bermejillo family, the ones from behind are believed to be anonymous and the one from the left is from Zumalabe (S.XIV - from the previous hermitage).