so a expedition under the flag of the bizantium empire discovers the continets bejond the atlantic ocean
and?
they name a few places, maybe the whole thing gets named after some orthodox saint
the expedition comes back with a description of a wast land full of people of redish complection, and fruits as are not found within known lands, warious kinds of animals and so forth
then the emperor reads the report, if it ewen reaches him, amongst a number of other papers he has to read or have read to him before mass, and spends the rest of the day concentrating on warious defence plans, and internal political issues
the report ider becomes a secret locked up untill someone decides to transcribe it into arabic, or it becomes a known fackt that ower the ocean theres a huge land full of resources to pilage and slaves to capture, at wich point its a freeforall
bizant gets none of it