Flavius Julius Crispus (/ˈkrɪspəs/; c. 295 – 326)
and his junior emperor (caesar)
from March 317 until his execution by his father in 326.
Crispus was the elder half-brother of the future augustus Constantine II
part of the settlement ending the Cibalensean War
between Constantine and his father’s rival Licinius I.
between 318 and 323
and defeated the navy of Licinius I at the Battle of the Hellespont in 324,
which with the land Battle of Chrysopolis won by Constantine
forced the resignation of Licinius and his son, l
eaving Constantine the sole augustus
and the Constantinian dynasty in control of the entire empire.
It is unclear what was legal status of the relationship
Crispus’s mother Minervina had with Constantine;
Crispus may have been an illegitimate son.
though the depiction may instead be of Fausta’s own son,
the future augustus Constantius II.
While at Augusta Treverorum,
was the great Junius Annius Bassus.
After his elevation to imperial rank,
at which point he was also entitled princeps iuventutis (“Prince of Youth”),
preserved in the Panegyrici Latini,
which honoured Crispus’s military victories over the Franks in c. 319.
Crispus was three times Roman consul,
for the years 318, 321, and 324.
Within two years of the defeat and surrender of Licinius,
Constantine had not only put his brother-in-law and former co-augustus to death,
but also executed his nephew Licinius II,
the son of his sister Flavia Julia Constantia.
after a trial whose real circumstances are mysterious,
Constantine executed Crispus at Pola (Pula) in 326.
Fausta, whose son Constantius II became caesar in November 324,
was also put to death,
wrote that Constantine had accused Crispus of incest with his stepmother.
After his death, Crispus was subjected to damnatio memoriae.
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