1) Byzantine military office 
The merarchēs (μεράρχης), sometimes Anglicized as Merarch, was a Byzantine military rank roughly equivalent to a divisional general. ==History== The title derives from the Greek words meros (Greek: μέρος, `part, division`) and archein (ἄρχειν, `to rule, command`). The term merarchēs is attested for the first time in the l...