Prince Karim Al-Husseini, known as the Aga Khan IV was the 49th imam of Isma'ilism. He held the position of Imam and the title of Aga Khan from 1957 to 2025, after succeeding to the position at the age of 20 upon the death of his grandfather, Aga Khan III. Aga Khan IV was also known by the religious title Mawlānā Hazar Imam by his Isma'ili followers.
Aga Khan's net worth was estimated over US$13.3 billion by Vanity Fair in 2013. Forbes described the Aga Khan as one of the world's fifteen richest royals. He was the founder and chairman of the Aga Khan Development Network, one of the largest private development networks in the world. The Aga Khan was a business magnate with British and Portuguese citizenship, as well as a racehorse owner and breeder.
From the time of his ascension to the Imamate of the Nizari Ismailis in 1957, the Aga Khan was involved in complex political and economic changes which affected his followers, including the independence of African countries from colonial rule, the expulsion of Asians from Uganda, the independence of Central Asian countries such as Tajikistan from the former Soviet Union and the continuous turmoil in Afghanistan and Pakistan. Aga Khan IV became the first faith leader to address the Joint Session of the Parliament of Canada on 27 February 2014.