The Armenian Kingdom, also known as the Kingdom of Armenia, was an ancient state that existed from around 321 BC to 428 AD. It was located in the region of Armenia, situated between the Black Sea and the Caspian Sea. The kingdom was known for its rich culture, trade, and early adoption of Christianity as a state religion in 301 AD, making it one of the first nations to do so. At its height, the Armenian Kingdom expanded under the rule of Tigranes the Great, who united various territories and established a powerful empire. The kingdom faced numerous invasions and conflicts, particularly from the Roman Empire and Persian Empire, leading to its eventual decline and incorporation into these larger empires.