Vagharshapat in the context of "Armenian Soviet Socialist Republic"

Etchmiadzin Cathedral is the mother church of the Armenian Apostolic Church, located in the city dually known as Etchmiadzin (Ejmiatsin) and Vagharshapat, Armenia. It is usually considered the first cathedral built in ancient Armenia, and often regarded as the oldest cathedral in the world.

The original church was built in the early fourth century—between 301 and 303 according to tradition—by Armenia's patron saint Gregory the Illuminator, following the adoption of Christianity as a state religion by King Tiridates III. It was built over a pagan temple, symbolizing the conversion from paganism to Christianity. The core of the current building was built in 483/4 by Vahan Mamikonian after the cathedral was severely damaged in a Persian invasion. From its foundation until the second half of the fifth century, Etchmiadzin was the seat of the Catholicos, the supreme head of the Armenian Church.

Armenian studies or Armenology (Armenian: հայագիտություն, pronounced [hɑjɑɡituˈtʰjun]) is a field of humanities covering Armenian history, language and culture. The emergence of modern Armenian studies is associated with the foundation of the Catholic Mechitarist order in the early 18th century. Until the early 20th century, Armenian studies were largely conducted by individual scholars in the Armenian communities of the Russian Empire (Moscow, Saint Petersburg, New Nakhichevan, Tiflis), Europe (Venice, Vienna, Paris, London, Berlin, Leipzig), Constantinople and Vagharshapat in Armenia. After the establishment of Soviet rule, Armenian studies, and sciences in general, were institutionalized in Armenia and put under direct control of the Academy of Sciences. Today, numerous research centers in many parts of the world specialize in Armenian studies.

The Catholicos of All Armenians (Armenian: Ամենայն Հայոց Կաթողիկոս) is the chief bishop and spiritual leader of Armenia's national church, the Armenian Apostolic Church, and the worldwide Armenian diaspora. The Armenian Catholicos (plural Catholicoi) is also known as the Armenian Pontiff (Վեհափառ, Vehapar or Վեհափառ Հայրապետ, Vehapar Hayrapet) and by other titles. According to tradition, the apostles Saint Thaddeus and Saint Bartholomew brought Christianity to Armenia in the first century. Saint Gregory the Illuminator became the first Catholicos of All Armenians following the nation's adoption of Christianity as its state religion in 301 AD. The seat of the Catholicos, and the spiritual and administrative headquarters of the Armenian Church, is the Mother See of Holy Etchmiadzin, located in the city of Vagharshapat.

The Armenian Apostolic Church is part of the Oriental Orthodox communion. This communion includes the Coptic Orthodox Church of Alexandria, the Ethiopian Orthodox Tewahedo Church, the Syriac Orthodox Church, the Malankara Orthodox Syrian Church, and the Eritrean Orthodox Tewahedo Church.

Ayrarat (Armenian: Այրարատ) was the central province of the ancient kingdom of Armenia, located in the plain of the upper Aras River. Most of the historical capitals of Armenia were located in this province, including Armavir, Yervandashat, Artashat, Vagharshapat, Dvin, Bagaran, Shirakavan, Kars and Ani (the current capital of Armenia, Yerevan, is also located on the territory of historical Ayrarat).