How could you think it´s for Vanilla, this is the EB forum after all.
Anyway, in Vanilla you can recruit Spartans in Syrakousai (or Syracuse as it´s called), which is enourmously ahistorical. It´s true that Sparte and Syrakousai was close allies and Spartan soldiers sometimes helped the Syrakousais in their struggles against the Kart-Hasdim and other Greek polises, but that´s a long way from actually having training your own Spartans in the very peculiar way young Spartans were trained, especially as Syrakousai was known for it´s low quality hoplites. It was instead famous for it´s good cavalry, that sadly didn´t make it into the game as it´s own unit, but I think the Hippeis Xystophoroi (Greek Noble Cavalry) recruitable in Syrakousai fills basically the same role.