Comentiolus ( el, Κομεντίολος, Komentíolos; died 610/611) was the brother of the

Eastern Roman emperor This is a list of the Byzantine emperors from the foundation of Constantinople in 330 AD, which marks the conventional start of the Eastern Roman Empire, to its fall to the Ottoman Empire in 1453 AD. Only the emperors who were recognized as l ...

Phocas (r. 602–610). Nothing is known of his early life except that he was the son of

Domentzia Domentzia ( el, Δομεντζία) was a name shared by the mother of the List of Byzantine emperors, Byzantine emperor Phocas (r. 602–610), and a daughter of the same emperor, likely named after her paternal grandmother.Martindale (1992), p. 40 ...

, along with Phocas and the later ''

magister officiorum The ''magister officiorum'' (Latin literally for "Master of Offices", in gr, μάγιστρος τῶν ὀφφικίων, magistros tōn offikiōn) was one of the most senior administrative officials in the Later Roman Empire and the early cent ...

'' Domentziolus. Raised by Phocas to the rank of '' patricius'' and the post of ''

magister militum (Latin for "master of soldiers", plural ) was a top-level military command used in the later Roman Empire, dating from the reign of Constantine the Great. The term referred to the senior military officer (equivalent to a war theatre commander, ...

'', he was in charge of the Byzantine Empire's eastern army facing the Sassanid Persians when Phocas was overthrown and executed by Heraclius (r. 610–641) in 610.. Comentiolus refused to acknowledge Heraclius's accession, and, bringing back the troops to winter quarters at

Ancyra Ankara ( , ; ), historically known as Ancyra and Angora, is the capital of Turkey. Located in the central part of Anatolia, the city has a population of 5.1 million in its urban center and over 5.7 million in Ankara Province, mak ...

, he planned to attack

Constantinople la, Constantinopolis ota, قسطنطينيه , alternate_name = Byzantion (earlier Greek name), Nova Roma ("New Rome"), Miklagard/Miklagarth (Old Norse), Tsargrad ( Slavic), Qustantiniya ( Arabic), Basileuousa ("Queen of Cities"), Megalopolis ( ...

and avenge the deaths of his brothers Phocas and Domentziolus. Heraclius pardoned his nephew, the son of Domentziolus (also named Domentziolus), and sent the respected former general Philippicus as an envoy. Comentiolus imprisoned Philippicus and threatened to have him executed, but was himself assassinated by the ''patricius'' Justin (late 610 or 611). The rebellion, and with it a serious threat to Heraclius's still shaky hold on power, died with him..

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