Isabel dos Santos is the richest woman in Africa. She is the eldest daughter of Angolaâ€™s longtime president Jose Eduardo dos Santos. This 41-year-old billionaire is currently working on expanding her stable of investments. She is a controlling stakeholder in Portugal Telecom Company Nos SGPS. Isabel dos Santos owns around 19 percent of Portuguese bank Banco BPI. Jose Eduardo dos Santos has transferred stakes in many companies to his daughter. Her holdings in Angola include 25 percent of Unitel, and a stake in Banco BIC. Unitel is the largest mobile carrier in Angola.