In international law a protectorate is a political entity (a sovereign state or less developed native polity, such as a tribal chiefstainship or feudal princely state) that formally agrees (voluntarily or under pressure) by treaty to enter into an unequal relationship with another, stronger state, called the protector, which engages to protect it (diplomatically or, if needed, militarily) against third parties, in exchange for which the protectorate usually accepts specified obligations, which may vary greatly, depending on the real nature of their relationship.