Excellent example of a cruciform church, possibly the first one of its kind ever built. It has the shape of a Greek cross, totally vaulted, a single nave, an apse and a portico forming two simetrical lower and narrower ends, and a crossing nave of equal height forming a balanced ensemble with the main one. It has a lantern covered by a hipped roof over the crossing of both.

Built around 940 by St. Rosendo in memory of his brother Froila, this small oratory of 8.5 x3.85 x 6m, built with large blocks of well cut granite, consists of three small areas communicated through horseshoe arches: a lobby covered with a horseshoe dome, a central nave of groin vault, both rectangular, and a horseshoe shaped apse inscribed in a square wih shell dome.

Small rectangular hermitage possibly built in the 15th century in which elements of one or several  High Medieval churches were reutilised, among which a magnificent horseshoe arch points out, of Visigothic trace, supported by impost capitals with a decoration that recalls the Ramiro art style, upon columns decorated and composed bases. It is also very interesting an Asturian type window with excellent openwork lattice in stone.