From SuspireWiki

(n., informal, archaic) A poetic (or pretentious) term for very ancient or old-fashioned Ventrue vampires. Among the kinds of Kindred this phrase describes, the childer of Aeneas are the Ventrue and the Dead Julii (q.v.), all of whom are legendarily descended from the Trojan hero, Aeneas.

The Priscus thinks all us childer of Aeneas would be better of with him as Prince.