Ivy Matsepe-Casaburri (President of South Africa)
Although not elected, Ivy Florence Matsepe-Casaburri made history as the first female President of South Africa, and the first Black female Head of State of South Africa after the reign of Queen Elizabeth II as Queen of South Africa ended in 1961. She served shortly as the Acting President of South Africa in 2005 when President Thabo Mbeki and his deputy left the country for official engagements.
She also served briefly as the Acting President for a few hours on September 2008, when the cabinet chose her as the constitutional and official interim head of state between the time Thabo Mbeki resigned and the assumption of office by President Kgalema Motlanthe.