Domentziolus or Domnitziolus (Δομνιτζίολος) was a brother of the Byzantine emperor Phocas

Phocas

Phocas was Byzantine Emperor from 602 to 610. He usurped the throne from the Emperor Maurice, and was himself overthrown by Heraclius after losing a civil war.-Origins:...

 (r. 602–610).

Phocas and his family were likely of Thraco-Roman

Thraco-Roman

The terms Thraco-Roman and Daco-Roman refer to the culture and language of the Thracian and Dacian peoples who were incorporated into the Roman Empire and ultimately fell under the Roman and Latin sphere of influence.-Meaning and usage:...

 origin. Phocas and Domentziolus' mother was named Domentzia

Domentzia

Domentzia was a name shared by the mother of the Byzantine emperor Phocas , and a daughter of the same emperor, likely named after her paternal grandmother.- Name :...

. A third brother is known, named Comentiolus

Comentiolus (brother of Phocas)

Comentiolus or Komentiolos was the brother of the Byzantine emperor Phocas .Nothing is known of his early life except that he was the son of Domentzia, along with Phocas and the later magister officiorum Domentziolus...

.

In 603, Phocas appointed Domentziolus as his magister officiorum

Magister officiorum

The magister officiorum was one of the most senior administrative officials in the late Roman Empire and the early centuries of the Byzantine Empire...

, a post he continued to hold throughout Phocas' reign. In 610, facing the revolt of Heraclius

Heraclius

Heraclius was Byzantine Emperor from 610 to 641.He was responsible for introducing Greek as the empire's official language. His rise to power began in 608, when he and his father, Heraclius the Elder, the exarch of Africa, successfully led a revolt against the unpopular usurper Phocas.Heraclius'...

, Domentziolus was sent by Phocas to man the Anastasian Wall

Anastasian Wall

The Anastasian Wall or the Long Walls of Thrace is an ancient, stone and turf fortification located west of Istanbul, Turkey built by the Byzantines during the late 5th century...

. When he heard however that Heraclius' fleet had reached Abydos, he fled to Constantinople

Constantinople

Constantinople was the capital of the Roman, Eastern Roman, Byzantine, Latin, and Ottoman Empires. Throughout most of the Middle Ages, Constantinople was Europe's largest and wealthiest city.-Names:...

. After the overthrow and execution of Phocas, he too was executed on the orders of Heraclius, but his apparent son, the general and curopalates

Curopalates

Kouropalatēs, Latinized as curopalates or curopalata and Anglicized as curopalate, was a Byzantine court title, one of the highest from the time of Emperor Justinian I to that of the Komnenoi in the 12th century...

Domentziolus

Domentziolus (nephew of Phocas)

Domentziolus or Domnitziolus was a nephew of the Byzantine emperor Phocas , appointed curopalates and general in the East during his uncle's reign. He was one of the senior Byzantine military leaders during the opening stages of the Byzantine–Sassanid War of 602–628...

, was spared at the intercession of Theodore of Syceon.

Sources