Flavius Julius Dalmatius (died c. 337), sometimes spelled Delmatius, was caesar of the Roman Empire from 335 to 337, under Emperor Constantine the Great. He oversaw Thrace, Macedonia, and Achaea.
The son of Constantine's half-brother Flavius Dalmatius, Dalmatius was educated by Bishop Exuperius while his family was in exile in Toulouse and by the poet Aemilius Magnus Arborius in Constantinople. His family came to Constantinople in the 330s and Dalmatius was raised to be the fourth caesar under Constantine, alongside Constantine II, Constans I, and Constantius II. Dalmatius was murdered by his soldiers during a massacre of the male members of the Constantinian dynasty after the death of Constantine. His territory was divided between Constantius II and Constans I.
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Early life
Flavius Julius Dalmatius, sometimes spelled Delmatius, was born in an uncertain year. His birthyear has been hypothesized to be c. 315. Dalmatius was the son of Flavius Dalmatius, who was the son of Constantius Chlorus and Flavia Maximiana Theodora. Constantine the Great was the uncle of Dalmatius. Constantius Chlorus might have named Flavius Dalmatius after the province of Dalmatia, which he once governed.
Flavius Dalmatius, having been born to a sitting emperor unlike Constantine, was a threat to Constantine and lived in exile in Toulouse until the later portion of Constantine's reign when he was made consul in 333, and administrator in Antioch. In Narbo or Toulouse, Dalmatius and his brother Hannibalianus were educated by Bishop of Toulouse Exuperius. After coming to Constantinople the brothers were educated by the poet Aemilius Magnus Arborius.