Lewis & Short

Lādas, ae, m., = Λάδας, a runner of Alexander the Great, whose name became a proverb for swiftness, Sol. 1, § 96; Mart. 10, 100, 5; 2, 86, 8; Cat. 55, 25; Auct. Her. 4, 3, 4; Sen. Ep. 85, 4: pauper locupletem optare podagram Ne dubitet Ladas, Juv. 13, 97.