Flag of Greece los reynos" depicts the flag of "the Empire of Constantinople" combining the red-on-white Cross of St George with the "tetragrammatic cross" of the ruling house of the Palaiologoi, featuring the four betas or "pyrekvola" ("fire-steels") on the flag quarters representing the imperial motto Βασιλεύς Βασιλέων Βασιλεύων Βασιλευόντων ("King of Kings Reigning over those who Rule"). The tetragrammatic cross flag, as it appears in quarters II and III in this design, is well documented. In the same Spanish atlas this "plain" tetragrammatic cross flag is presented as (among other places in the Empire) "the Flag of Salonika" and "the real Greece
Flag of the Greek Orthodox Church of the Byzantine Empire. The double-headed eagle was historically used as an emblem in the late Byzantine period (14th–15th centuries), but not on flags; rather it was embroidered on imperial clothing and accoutrements by both the Palaiologos emperors of the Byzantine Empire and the Grand Komnenos rulers of the Empire of Trebizond, descendants of the Byzantine imperial family of the same name. The actual flag of the Palaiologan-era Byzantine Empire was based on the tetragrammatic cross in gold on a red background. This design also forms the basis for another flag used by the Orthodox Church of Greece, with the