Question: Which European empire, divided into autonomous kingdoms and ruled by an emperor with little authority outside of his own kingdom, is the subject of the "Annales mosellani"?
Sentence (from "End of the Han dynasty"): Eventually, one of those warlords, Cao Cao, was able to gradually reunify the empire, ostensibly under Emperor Xian's rule, but the empire was actually controlled by Cao Cao himself.
Relevant evidence: No