The Church of Saint Demetrius of Thessaloniki in Veliko Tarnovo, Bulgaria, a medieval Bulgarian Orthodox church, was part of a monastery and played a role in the anti-Byzantine Uprising of Asen and Peter in 1185. Destroyed in the 13th century, it was reconstructed in the 1350s. Plundered in the 18th and 19th centuries, it was completely destroyed by an earthquake in 1913, leaving only the apse and fragments of frescoes. Reconstruction began in 1977–1985, led by Teofil Teofilov, based on architectural remains and examples from better-preserved Bulgarian churches. Two layers of frescoes, dating to the church's construction and the 14th century, have been preserved.
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.