- Oct 2011
I can think of several times when Roman Empire was hard-pressed for troops - Crisis of the Third Century, Migration Period, wars with Persia. So why did Thematic system of military lands only appear in 7th century? Is it because up until 7th century the emperors were more worried about rebellion/usurpation than about foreign invasions? And why didn't system appear in Western Empire in 5th century - was it the same reason, or maybe too much latifundia, or something else?