The pre-Romanesque church of San Miguel de Lillo or San Miguel de Liño, dedicated to San Miguel Arcángel, built by King Ramiro I on Mount Naranco. It is located a few metres from Santa María del Naranco. According to the chronicle of Albeldense, this monarch probably ordered it to be built next to his palaces, with the function of a palatine church. In principle, it may have been dedicated to Santa María and San Miguel.

In January 2009, it was warned of an imminent collapse of the structure and of an almost irreparable deterioration in general and of the paintings due to the great humidity that plagues it. Restoration work was carried out in 2011.

Originally, it had a basilica plan with three naves, but only a third of its length has been preserved, because during the 13th or early 14th century it was ruined, possibly due to the poor condition of the ground. Only the vestibule and the beginning of its three naves have survived. Above the first is the royal tribune, flanked on either side by two small rooms.

The roof is vaulted with a complex system of half-barrel vaults. The naves are separated by arches resting on columns, which is unusual in Asturian art, as the pillar is usually used as a support. These columns rest on tall square bases that house sculptural decoration of arches framing figures.

It is mostly made of ashlar, although the corners of the walls and buttresses are made of ashlar. The windows have beautiful latticework carved in stone. The construction is slender and shows a certain interest of its author in proportions, since its height is three times the width of its naves.