The United Kingdom of Transcaucasia is a nation located on the border of Eastern Europe and Middle East. The region where the United Kingdom inhabits has been an arena for political, military, religious, and cultural rivalries and expansionism for centuries. However, throughout the early history of Transcaucasia, the region had been incorporated into political entities belonging to the Iranian world. However, at the beginning of the 13th/19th century Russia took it from the Qajars, severing those historical ties. Ancient kingdoms of the region included: Armenia, Albania, Colchis and Iberia among others. These kingdoms were later incorporated into various Iranian empires, including Media, Achaemenid Empire, Parthian Empire, and Sassanid Empire. By this time, Zoroastrianism had become the do