It is difficult to determine when exactly the cataphract saw his final day. After all, cataphracts and knights fulfilled a roughly similar role on the medieval battlefield, and the armored knight survived well into the early modern era of Europe. The Byzantine army maintained units of heavily armored cavalrymen up until its final years, mostly in the form of Western European "Latinikon" mercenaries, while neighbouring Bulgars, Serbs, Avars, Alans, Lithuanians, Khazars and other Eastern European and Eurasian peoples emulated Byzantine military equipment. During medieval times, the Draco banner and Tamga of Sarmatian cataphracts belonging to the tribe of Royal Sarmatians, was used by the Clan of Ostoja and become Ostoja coat of arms.