The Catholicos of the East and His People is a historical book written by Arthur John Maclean in 1892. The book provides a comprehensive account of the Catholicos of the East, who was the head of the Assyrian Church of the East, and his people. Maclean's study focuses on the religious and social aspects of the Assyrian Church of the East, which has its roots in the ancient Christian community of Mesopotamia. The book covers the history of the Assyrian...