It is not clear which office Patricius Caesarius held - scholars are debating whether he was magister militum Spaniae or one of the exarchs of Africa (PLRE Caesarius 2; further bibliography Morossi 2013: 153-155). From the extant correspondence with King Sisebut we can only say that he was a Byzantine officer who was engaged on behalf of emperor Heraclius to negotiate to end hostilities between the Byzantines and Visigoths.