 The diocese was officially founded on August 31, 1920, upon a kontakion issued by Catholicos George V. The seat of the diocese is the Cathedral of the Holy Mother of God in Gyumri.The prelacy building is located on Rizhkov street near the cathedral, at the centre of Gyumri.In the final days of the First Republic of Armenia, the diocese was established upon a "kontakion" issued by Catholicos George V on August 31, after being separated from the Araratian Pontifical Diocese.