Miriarcha is the name given in the Chronicon breve normannicum to the Byzantine general who led the defence of the Catapanate of Italy in 1060–1062.
[1] The actual name of the general is unknown,[1] and since the rank of merarches is not otherwise clearly attested in southern Italy his exact function is not known either.
In response, the new Byzantine emperor Constantine X dispatched reinforcements under the command of a merarch.
[1] Although his title implies that he had command of only a small army,[1] the merarch managed to retake the cities of Taranto, Brindisi, Oria and Otranto.
He was aided in this by the revolt of the city of Troia, which Guiscard had to besiege before he could turn his attention to the Byzantines.