St. Michael of Lillo is a Roman Catholic church built on the Naranco mount, near the Church of Santa María del Naranco. It was completed in 842 and it was consecrated by Ramiro I of Asturias and his wife Paterna in the year 848. It was originally dedicated to St. Mary until this worship passed to the nearby palace in the 12th century, leaving this church dedicated to Saint Michael. It has been a UNESCO World Heritage Site since 1985.
It originally had a basilica ground plan, three aisles with a barrel vault, although part of the original structure has disappeared as the building collapsed during the 12th or 13th century. Nowadays, it conserves its western half from that period, together with several elements in the rest of the church such as the fantastic jambs in the vestibule or the extraordinary lattice on the window of the southern wall, sculpted from one single piece of stone.
References:Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.