The Holy Trinity Cathedral is a Bulgarian Orthodox cathedral in the city of Ruse on the Danube river. It stands next to the modern day opera house. Built beneath the ground in 1632, it is the oldest church in the city and was constructed during the period of Ottoman occupation. As it keeps the holy relics of a number of saints, Ruse's cathedral is often visited by pilgrims. Its rich history and underground interior also pose an interest for tourists, making it one of the main attractions of the city.
It is a three-nave pseudo-basilica that is 31.20 m long and 15.60 m wide. Two rows of seven columns separate the naves. It was dug four and a half meters below the level of the yard due to the requirements of Ottoman authorities. The remains of catacombs, possibly dating back to the fifth century, are located in the southwest corner of the temple. During Ottoman rule, it was easier to issue permission for the construction of a new church at the location of an older temple. The Christians of Ruse presumably used the old catacomb to build the church.
The hexagonal belfry is 19 m high and was built with stones from the fortification facilities around the Ruschuk fortress, demolished by decision of the Berlin Congress from July 1878. There are five bells in the belfry. In the cathedral's narthex are the graves of four bishops of the Dorostolo-Cherven diocese: Grigoriy, Valisiy, Mihail, and Sofroniy.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.