The Kingdom of Armenia was an ancient state located in the South Caucasus region, existing from around 321 BC to 428 AD. It was known for its rich culture, strategic location, and as a center of trade between Europe and Asia. The kingdom reached its peak under the rule of Tigranes the Great, who expanded its territory significantly. The kingdom was the first to adopt Christianity as its state religion in the early 4th century, making it a significant player in the spread of Christianity. The Armenian Apostolic Church remains one of the oldest Christian denominations in the world, reflecting the kingdom's lasting religious influence.