Legio XV Primigenia (Fortune's Fifteenth Legion") was a legion of the Imperial Roman army. Primigena ("firstborn") was one of the nicknames accorded to the Roman goddess Fortuna. Primigenia is an adjective, meaning "of Primigena".
It was originally levied by the emperor Caligula in 39 AD, to aid in the Germanic campaigns and was stationed in the Rhine frontier until 70, when it was destroyed during the Batavian rebellion.