His Highness the Aga Khan became Imam (spiritual leader) of the Shia Imami Ismaili Muslims on July 11, 1957 at the age of 20, succeeding his grandfather, Sir Sultan Mahomed Shah Aga Khan. He is the 49th hereditary Imam of the Shia Imami Ismaili Muslims and a direct descendant of the Prophet Muhammad (peace be upon him and his family) through his cousin and son-in-law, Ali, the first Imam, and his wife Fatima, the Prophet's daughter.
refer to link below
answer of last question............ aga khan foundation is the branch of aga khan network.
Aga Khan I was born in 1804.
Aga Khan I died in 1881.
An Aga Khan is a name for any of the leaders of the Ismaili.
His Highness Prince Karim Aga Khan was born on December 13, 1936.
Aga Khan is leader of his own religion!
Aga Khan Museum was created in 2013.
Aga Khan II died in 1885.
Aga Khan II was born in 1830.
Aga Khan IV was born in 1936.
Khaliya Aga Khan was born in 1976.
Aga Khan III died in 1957.