Arsacid dynasty of Armenia in the context of "Kingdom of Armenia (antiquity)"

The Armenian Apostolic Church (Armenian: Հայ Առաքելական Եկեղեցի, romanized: Hay Aṙaqelakan Ékełetsi) is the autocephalous national church of Armenia. Part of Oriental Orthodoxy, it is one of the most ancient Christian churches. The Armenian Apostolic Church uses the Armenian Rite. The Kingdom of Armenia was the first state in history to adopt Christianity as its official religion (under the Armenian Apostolic traditions) during the rule of King Tiridates III, of the Arsacid dynasty in the early 4th century.

According to tradition, the church originated in the missions of Apostles Bartholomew and Thaddeus (Jude) in the 1st century. St. Gregory the Illuminator was the first official primate of the church. It is sometimes referred to as the Armenian Apostolic Orthodox Church, Armenian Church or Armenian Gregorian Church.

The Parthian language, also known as Arsacid Pahlavi and Pahlawānīg, is an extinct ancient Northwestern Iranian language once spoken in Parthia, a region situated in present-day northeastern Iran and Turkmenistan. Parthian was the language of state of the Arsacid Parthian Empire (248 BC – 224 AD), as well as of its eponymous branches of the Arsacid dynasty of Armenia, Arsacid dynasty of Iberia, and the Arsacid dynasty of Caucasian Albania.

Parthian had a significant impact on Armenian, a large part of whose vocabulary was formed primarily from borrowings from Parthian, and had a derivational morphology and syntax that was also affected by language contact but to a lesser extent. Many ancient Parthian words were preserved and now survive only in Armenian. The Semnani or Komisenian languages and Zaza language have similarities with Parthian language and they may descend from Parthian directly or Northwestern Iranian languages with Parthian influences, but the topic lacks sufficient research.

Roman Armenia refers to the rule of parts of Greater Armenia by the Roman Empire from the 1st century AD to the end of Late Antiquity. While Armenia Minor had become a client state until it was incorporated into the Roman Empire proper during the 1st century AD, Greater Armenia remained an independent kingdom under the Arsacid dynasty. Throughout this period, Armenia remained a bone of contention between Rome and the Parthian Empire, as well as the Sasanian Empire that succeeded the latter, and the casus belli for several of the Roman–Persian Wars. Only in 114 would Emperor Trajan conquer and incorporate it as a short-lived Roman province.

In the late 4th century, Armenia was divided between Rome and the Sasanians, who took control of the larger part of the Armenian Kingdom and, in the mid-5th century, abolished the Armenian monarchy. In the 6th and the 7th centuries, Armenia once again became a battleground between the East Roman Empire (Byzantine) and the Sasanian Empire until both powers were defeated and replaced by the Muslim Caliphate in the mid-7th century.

Tiridates III (c. 250s – c. 330), also known as Tiridates the Great or Tiridates IV, was the Armenian Arsacid king from c. 298 to c. 330. In the early 4th century or according to tradition in 301,Tiridates adopted Christianity as the state religion of Armenia, thus making the Kingdom of Armenia the first state to officially embrace Christianity.

Gregory the Illuminator (c. 257 – c. 331) was the founder and first official head of the Armenian Apostolic Church. He converted Armenia from Zoroastrianism to Christianity in the early fourth century (traditionally dated to 301), making Armenia the first state to adopt Christianity as its official religion. He is venerated as a saint in the Armenian Apostolic Church and in some other churches.

Gregory is said to have been the son of a Parthian nobleman, Anak, who assassinated the Arsacid king of Armenia Khosrov II. The young Gregory was saved from the extermination of Anak's family and was raised as a Christian in Caesarea of Cappadocia, then part of the Roman Empire. Gregory returned to Armenia as an adult and entered the service of King Tiridates III, who had Gregory tortured after he refused to make a sacrifice to a pagan goddess. After discovering Gregory's true identity, Tiridates had him thrown into a deep pit well called Khor Virap for 14 years. Gregory was miraculously saved from death and released after many years with the help of Tiridates' sister Khosrovidukht. Gregory then converted the King to Christianity, and Armenia then became the first country to adopt Christianity as a state religion in 301 AD. Gregory, the Illuminator, then healed King Tiridates, who the hagiographical sources say had been driven mad by his sins, and preached Christianity in Armenia. He was consecrated bishop of Armenia at Caesarea, baptized King Tiridates and the Armenian people, and traveled throughout Armenia, destroying pagan temples and building churches in their place.

The Arsacid dynasty was a dynasty of Parthian origin, which ruled the kingdom of Caucasian Albania from the 3rd to the 6th century. They were a branch of the Arsacid dynasty of Parthia and together with the Arsacid rulers of the neighboring Armenia and Iberia formed a pan-Arsacid family federation.