Saleh Al Rajhi was born in Saudi Arabia. Eldest of the 3 brothers behind $33 billion (assets) Al Rajhi Bank. With billionaire siblings, Sulaiman, Abdullah and Mohammed, built small money-changing business in Saudi Arabia's Najd desert into world's largest Islamic bank, the $33 billion (assets) Al Rajhi Bank. Shariah-compliant finance proved as vulnerable to the downturn as its secular counterpart but shares are on the rebound: up 80% since last March's lows. Nonagenarian also invested in Kingdom's expanding agriculture sector: owns 11% stake in one of country's biggest wheat producers and in July sold poultry business Hail Agricultural Development to Gulf's dairy giant Almarai for $253 million.