In the Muslim world, titles of monarchs include caliph (successor to the Islamic prophet Muhammad and a leader of the entire Muslim community), padishah (emperor), sultan or sultana, shâhanshâh (emperor), shah, malik (king) or malikah (queen), emir (commander, prince) or emira (princess), sheikh or sheikha, imam (used in Oman). East Asian titles of monarchs include "huángdì" (emperor or empress regnant), "tiānzǐ" (son of heaven), "tennō" (emperor) or "josei tennō" (empress regnant), "wang" (king) or "yeowang" (queen regnant), "hwangje" (emperor) or "yeohwang" (empress regnant). South Asian and South East Asian titles included "mahārāja" ( high king) or "maharani" ( high queen), "raja" (king) and "rana" (king) or "rani" (queen) and "ratu" (South East Asian queen). Historically, Mongolic and Turkic monarchs have used the title "khan" and "khagan" (emperor) or "khatun" and "khanum"; Ancient Egyptian monarchs have used the title "pharaoh" for men and women. In Ethiopian Empire, monarchs used title "nəgusä nägäst" (king of kings) or nəgəstä nägäst (queen of kings).