Those involved in social welfare included the accelerated development of schools and community centres, and a modern, fully equipped hospital in Nairobi.
While most of the Ismailis in Syria transferred their allegiance to the Qasim Shahi line of Aga Khan III in 1887, the Ismailis of Qadmus and Masyaf remained affiliated with the Muhammad Shahi line.
A prominent user in Europe in the early 1950s was the Aga Khan.
The Mausoleum of Aga Khan is the mausoleum of Aga Khan III, Sir Sultan Muhammed Shah, who died in 1957.
In 1941, Vanderbilt teamed up with Walter P. Chrysler, Jr. and other investors to acquire for breeding services the 1935 English Triple Crown winner Bahram from the Aga Khan III.
Lady Camrose had twice been previously married, first to Loel Guinness, and secondly to Prince Aly Khan, son and heir apparent of Aga Khan III.
Sultan Muhammed Shah Aga Khan III (1877–1957), 48th Imam of the Nizari Ismaili community
Chrysler, Jr. was part of a syndicate that included friend Alfred G. Vanderbilt II who in 1940 acquired the 1935 English Triple Crown winner Bahram from the Aga Khan III.
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On this subject, at the Council of Four on 17 May 1919, he introduced representatives of Muslim India (including the Aga Khan) and urged that Muslim peoples were beginning to see the Conference as "taking sides against Islam".