- Oct 2011
Opsikion = Territory sustaining Emperor's field armies
Armeniakon = Territory sustaining an eastern field army
Anatolian = Territory sustaining old Anatolian field army
Do you think is possible some Limitanei, since early called Akritai on the Greek east, were kept in border areas?
Found it. It is listed in Treadgold, Byzantium and Its Army pg.74, as well as in Haldon, Warfare, State and Society in the Byzantine World.I think I remember a book which precisely listed which field army was assigned to which theme - I know one of themes in Asia Minor was used to sustain Army of Thrace - but I do not remember which book that is.
Warfare, State And Society In The Byzantine World 560-1204
Imperial Praesental armies (40 000) - northwest Anatolia and Thrace (Opsikion theme - 34 000)
Army of Orient (20 000) - southern central Asia Minor (Anatolikon theme - 18 000)
Army of Armenia (15 000) - eastern and northern Asia Minor (Armeniakon theme - 14 000)
Army of Thrace (20 000) - central western Anatolia (Thrakesion theme - 8 000)
Army of Illyricum (15 000) - coast and islands of Greece (Carabisian theme - 4 000)
Army of Italy (20 000) - island of Sicily (Sikelas theme - 2 000)
You can find a map of themes here, fan-made apparently but seems correct from what I know:
So six field armies survived out of total of eight. These surviving armies formed first six themes, four of them in Anatolia, which were later split up (especially the troublesome Anatolikon and Opsikion themes).