Sioni Cathedral is named after the Mount Zion at Jerusalem. The church represents medieval Georgian architecture and it is designed in a modest and restrained style.
It is said that the original church was constructed by the king Vakhtang Gorgasali, founder of Tbilisi. It was destroyed by invaders throughout centuries as well as by an earthquake in 1668, and reconstructed several times. This church is said to be totally restored by the king David the Builder in 1122. Even though it was again destroyed and restored several times since then, the plan of the church has not changed considerably since the 12th century. Sioni church had been the crypt of Georgian Patriarchs. According to the saying, St. Evstati Mtskheteli (died in 550 in tortures) lies in rest under the refectory.