Boreas - A Northern Province of rough mountain folk, ruled by Chieftan Kings who pay homage to the Empire with soldiers trained in the Imperial fashion. They live in rough conditions and give reverence to strange gods, but they are known for their fierce loyalty. 

Cataphract - Middle class landowners recruited into the Imperial army for military service, paid double the infantryman's pay and trained to fight in horse formations. 

Ultoi Cataphract - Cataphracts personally employed by the emperor or a Dynatoi 

Latinikon - Mercenary Cataphracts 

Dynatoi - was a legal term in the Empire used from the 10th century on, denoting the senior levels of civil, military and ecclesiastic (including monastic) officialdom, who usually, but not always, also commanded considerable fortunes and landed estates.

Protostate - Imperial Infantry