Carthage: prominent Carthaginians often married the daughters of prominent locals to gain their allegiance or sometimes even gave thier own daughters.

During the 2nd punic war the battle of great plains was possible basically thanks to two factors: Hasdrubal (might be the wrong name) giving is daughter in marriage to Syphax to regain allegiance of at least part of the numidians and 4000 celtiberian heavy mercenaries to reinforce the backbone of the army.