This Sunday, June 19, is the Feast of Holy Mother Etchmiadzin, the cathedral built by St. Gregory after his deliverance from the pit, to the specifications he saw in a vision, and on the place marked by the Lord with a golden hammer. The construction of the cathedral marked the culmination of the establishment of Christianity as official religion of Armenia. Etchmiadzin is the oldest example of a four- pillar, cruciform church in Christian architecture. More than 1,700 years old, it is the oldest surviving Armenian Christian site. Relief sculptures on the exterior walls are some of the oldest examples of the Christian Armenian art of sculpting.