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Prince Karim Al-Husseini Aga Khan (Arabic: شاه كريم الحسيني, Shāh Karīm al-Ḥusaynī; 13 December 1936 – 4 February 2025), known as the Aga Khan IV (Persian: آقاخان چهارم, Āqā Khān Chahārom), was a religious leader, businessman, and socialite best known as the 49th imam of Isma'ilism from 1957 until his death in 2025. He inherited the Nizari imamate and the title of Aga Khan at the age of 20 upon the death of his grandfather, the Aga Khan III. He was also known by the religious title Mawlānā Hazar Imam by his Isma'ili followers.