Short answers, pulled from the story.
The Kingdom of Greater Armenia was an Armenian monarchy in the Ancient Near East that existed from 331 BC to 428 AD, a span of nearly eight centuries. Its history passed through three successive royal dynasties: the Orontid (331-200 BC), the Artaxiad (189 BC-12 AD), and the Arsacid (52-428 AD).
Armenia officially adopted Christianity as its state religion in 301 AD, when King Tiridates III converted after Gregory the Illuminator spread Christianity through the kingdom. This made Armenia the first state in history to embrace Christianity officially, preceding the Roman Emperor Constantine the Great's conversion and the Edict of Milan by roughly a dozen years.
Tigranes the Great was the Artaxiad king of Armenia who expanded the kingdom into a brief empire, ruling at its peak from 83 to 69 BC. His territory extended across parts of the Caucasus and into areas now comprising south-eastern Turkey, Iran, Syria, and Lebanon, incorporating Cappadocia, Cilicia, Sophene, Judea, Adiabene, Commagene, and other regions, with Parthia and certain Arab tribes paying him tribute.
According to the Greek historians Plutarch and Strabo, the Carthaginian general Hannibal received hospitality at the court of the Armenian king Artaxias I and then planned and supervised the actual building of Artashat. Artaxias I founded the city in 185 BC at the confluence of the Araks and Metsamor rivers near Mount Ararat, and its position on the Silk Road made it a major center of trade linking Persia and Mesopotamia with the Caucasus and Asia Minor.
In 387, the Kingdom of Armenia was partitioned between the Eastern Roman Empire and the Sassanid Persian Empire. The western portion eventually became Byzantine Armenia, while eastern Armenia remained nominally a kingdom within the Persian sphere. In 428, the local nobility deposed the last Arsacid king, and the Sassanids replaced the monarchy with a marzban (governor), ending independent Armenian statehood until the Bagratuni dynasty revived it in 885.
Saint Mesrop Mashtots and Isaac of Armenia (Sahak Partev) created the Armenian alphabet in 405 AD, primarily to produce a Bible translation into the Armenian language. Before this, Armenians wrote using Aramaic and Greek scripts.