The construction of the monastery was completed by Grigor Tatevatsi, who after the death of Hovhan Vorotnetsi in 1386 replaced him as the head scholar, and in 1391, due to the invasion of Timur, was forced to leave Yernjak.

In 1655, the monks Isaiah and Lazarus built a new church with a four-domed basilica with two-storeyed apses on either side of the tabernacle.

The main part of St. Karapet Church was built of polished basalt, and the high, slender drum dome was made of brick.

In 1705, Mr. Aghamal from Nakhchivan built a two-story bell tower on the roof of St. Stephen Chapel.

The sons of Naghash Hovnatan, Harutyun and Hakob, decorated interior of St. Karapet Church with high-art frescoes in 1740, and the portraits of the Virgin Mary, Paul and Peter were the best preserved parts.