relating to or belonging to of the ancient city of Byzantium or its empire
of or in a style of architecture developed in the Byzantine Empire in the fourth to sixth cents, featuring a central dome built over a square space and extensive use of mosaics
Byzantine is a style which originated at Byzantium (Constantinople), the Eastern capital of the Roman Empire, in the fourth cent., spreading around the Mediterranean and, with Eastern (Orthodox) Christianity, from Sicily to Russia in the following centuries. It developed the round arches, vaults, and domes of Roman architecture but eschewed formalized classical detail in favour of lavish decoration and ornament of emblematic and symbolic significance — Charles O'Brien
complex to the point of being confusing or obscure; labyrinthine
characterized by trickery and deception; underhand
[late Latin Byzantinus, from Byzantium, ancient name of Istanbul, city in Turkey]