Husseini, known as Aga Khan IV, passed away on February 4, 2025, at 88, after serving as the 49th imam of Nizari Ismaili Muslims for more than 67 years.

At the age of 20, Prince Karim Al-Hussaini inherited the reins of a Shia Muslim lineage and used his entrepreneurship to become one of the world’s richest hereditary rulers.

The Aga Khan IV then took control of the Thoroughbred operation in 1960 following the death of his father. He earned France's leading owner title in his first year at the helm, and success followed in the years to come with names like Blushing Groom,