<h1>Aga Khan IV, Ismaili Muslim spiritual leader, dies at 88; legacy includes philanthropy and development across 30+ countries.</h1> The spiritual leader of Ismaili Muslims, the Aga Khan IV, passed away at age 88 in Portugal. He became the leader at 20, succeeding his grandfather, and was known for his philanthropic efforts through the Aga Khan Development Network, which focuses on health, education, and economic development in over 30 countries. His successor will be announced after a will-reading in Lisbon. The Aga Khan was regarded as a bridge-builder between Muslim societies and the West, and his contributions were acknowledged by global leaders. He leaves behind a substantial legacy in philanthropy and development.