Definitions of Byzantine:

• noun:   a native or inhabitant of Byzantium or of the Byzantine Empire
• adjective:   highly involved or intricate

  Example: "The Byzantine tax structure"

• adjective:   of or relating to or characteristic of the Byzantine Empire or the ancient city of Byzantium
• adjective:   of or relating to the Eastern Orthodox Church or the rites performed in it

  Example: "Byzantine monks"

• adjective:   characterized by elaborate scheming and intrigue; devious

  Example: "Byzantine methods for holding on to his chairmanship"