Through her mother (a great-great-great granddaughter of Augustus), Domitia Longina was a direct descendant of Augustus Caesar and one of the last remaining members of the Julian lineage.
Little is known about the life of Domitia before her marriage to Domitian, but sometime before 70, Domitia was married to Lucius Aelius Plautius Lamia Aelianus, a man of senatorial rank [REF].