Ancient Greek mercenaries

There is evidence of mercenaries (misthophoroi (plural), misthios (singular male), misthia (singular female) in Greek) being hired in Ancient Greece from the 6th century BC. The tyrants of that time hired bodyguards from other city-states. It is not known if earlier Aegean armies and navies, such as the Minoans and Mycenaeans, used mercenaries.

Source: Wikipedia — Ancient Greek mercenaries (CC BY-SA 4.0)