Question about ancillaries.

[Malrubius]

Ah, ok, I thought you were just asking about the genetics part of things.

Well, the main visible effect of Command stars themselves seems to be that they provide a morale boost to nearby units:
https://forums.totalwar.org/vb/showthread.php?t=44549

They will be generally more difficult to acquire than in the original game, depending on the general's natural ability. But good leaders can inspire their men, and soldiers feel more confident when commanded by capable generals.

[Mongoose]

So, your saying that all ancillaries will be available to the "barbarian" Factions?

Or will they have to take a greek/roman/eastern city first?