Hibernia Regiment (Spain)
The Hibernia Regiment was an infantry regiment of the Spanish Army. Known by many in Spain as "O'Neill's Regiment", it was formed in 1709 from Irishmen who fled their own country in the wake of the Williamite War in Ireland and the penal laws and who became known as the Wild Geese - a name which has become synonymous in modern times for Irish mercenaries and soldiers throughout the world.
Source: Wikipedia — Hibernia Regiment (Spain) (CC BY-SA 4.0)