 The Patriarchal Cathedral of the Holy Ascension of God is located on top of the Tsarevets hill , overlooking the modern city of <unk> Tarnovo . The church was part of a group of buildings which constituted the seat of the Bulgarian <unk> and acted as the city and the country 's main cathedral . The <unk> on Tsarevets was a fortress of its own , with two defensive towers and an entrance on its west wall . The Patriarchal Cathedral stood in the middle of its courtyard . 
