King sultan and emir are all titles given to?

King, sultan, and emir are all titles used to denote rulers or leaders in various cultures, particularly in the Middle East and parts of North Africa. A king typically rules a kingdom, while a sultan is a sovereign leader, often in Islamic contexts. An emir is a title of authority that can refer to a commander or leader, often in military or governance roles, particularly in the Arab world. These titles reflect the historical and cultural significance of leadership in their respective regions.