Dr James Sebe Moroka, medical doctor, landowner and politician who was elected president-general of the African National Congress (ANC) from 1949 to 1952, was born in Thaba Nchu, Orange Free State. He was a great grandson of Chief Moroka I of the Barolong Boo Moroka at Thaba Nchu. Today one of the municipalities on the Mpumalanga highveld is named after him. 

Sources:

1. Verwey, E.J. (ed)(1995). New Dictionary of South African Biography, v.1, Pretoria: HSRC.
2. http://people.africadatabase.org/en/person/3052.html