Angola’s President Jose Eduardo dos Santos has appointed his daughter as head of the state oil company Sonangol.
Isabel dos Santos, named by Forbes magazine as Africa’s richest woman, worth an estimated $3.3bn (£2.3bn), takes on the job after the entire board was sacked by her father in April.
Angola and Nigeria are Africa’s largest oil producers.
Critics accuse President dos Santos, who has ruled since 1979, of being increasingly authoritarian.
He is Africa’s second longest-serving leader, after Equatorial Guinea’s Teodoro Obiang Nguema Mbasogo.
The southern African state is also rich in diamonds, which fuelled a 27-year civil war in the country.