Armenian Cathedral of the Assumption of the Blessed Virgin Mary was built in 1363 by architect Doring. The architecture of the church has united different styles: Old Russian, Roman, Gothic and traditional Armenian. At the same time the church bell tower was built, but during the siege of Lviv, it was burned by the Turks, but was later restored.

The oldest part of the cathedral - the eastern, built in 1368-1370, respectively. In 1437 it completed the arcade, in 1630 - the middle part. From 1631 to 1671 years, the Armenian Cathedral was rebuilt and expanded. In 1723, the church changed appearance: stone and brick masonry walls plastered closed, and in 1731 was attached to the north side of the sacristy. Near the temple was built a chapel.

In 1908-1920 under the project of Francis Monchinsky it was made restoration and completion of the western facade of the church tower was decorated with mosaics and the walls were painted by Jan Henry Rosen. At the end of XIV - early XV centuries the interior of the church were decorated with frescoes, executed in the style of old Russian painting. Some of them have survived.

The monastery courtyard on the north wall of the cathedral on the opposite side of the building limits of Armenian Benedictine monastery, built in 1682. East patio associated with Baroque monastery gate in 1671. This courtyard is called Hristoforova, as it stands in the center of St. Christopher commemorative column of the XVIII century. On all sides closed courtyard houses the former Armenian bank, the Archbishop's Palace, the bell tower and apse of the cathedral.

In the southern courtyard, located between the street and the cathedral, the remains of an ancient graveyard - tombstones transferred from other cemeteries date back to the fourteenth and eighteenth centuries.