 Prince Sadruddin Aga Khan , KCSS ( Urdu : صدرالّدين آغا خان , Ṣadr ad @-@ Dīn Āghā Khān , 17 January 1933 – 12 May 2003 ) served as United Nations High Commissioner for Refugees from 1966 to 1978 , during which he reoriented the agency 's focus beyond Europe and prepared it for an explosion of complex refugee issues . He was the younger brother of the Aga Khan III .
Sadruddin was born in Paris , France , the son of Sultan Mohamed Shah Aga Khan III , the 48th Imam of the Nizari Ismaili Muslims , and his wife Rattanbai ( Fatima )