Terminology
Ostmen: OTL Norsemen
Ismaili, Ismailism: TTL’s equivilant of Islam, which has more of a Jewish feel thanks to Himyarite influence.
Leontine Plague: Roughly analogous to the Plague of Justinian. Hit shortly before the Ismailis invaded the Rhomanians.
Askraland: OTL Iceland
Insula Benedicta/Inis Tairngire: OTL Newfoundland
Tálbeah/Terra Ursus: OTL North America
Fánaí, Fánaithe: Similar to fur trappers or coureur du bois; adventurers originally coming to the New World for the fur trade. Also a general term for a Gael/Irishman living in the New World.
Measctha: A person of mixed European/Native American descent. Measctha living on the continent are assimilated into the general population, while Measctha on the Insula have their own traditions.
Cumbraek: The dialect of British Celtic spoken by Owain and his fellow Britons. Similar to Welsh.
Bay of Saint Peter: OTL Gulf of Saint Lawrence
Onogurs: A Turkic group that invaded the Balkans during the Leontine Plague. Roughly analogous to the OTL Bulgars.
Gorfodi: A title given to Owain and his descendants, meaning “Enforcer”. The real power in the late 9th and 10th Century New World, ruling in the name of the Bishop.
Peace of Armagh: A 7th Century peace treaty that established that the Bishop-Abbott on the Insula is the highest secular authority in the West.
Company: A term for the clan-like divisions of the Fánaithe and their descendants in the New World. Originally money-making entities, they took on a more symbolic meaning after permanent Gaelic settlement began. Some were as small as fifty while others were fairly good sized. After the Reconquest, the number of Companies has drastically shrunk and consolidation has taken place under the allies of Owain.
(Work in progress; let me know of any other confusing terms)