Prime Minister of Rhodesia
The prime minister of Rhodesia (Southern Rhodesia before 1964) was the head of government of Rhodesia. Rhodesia, which had become a self-governing colony of the United Kingdom in 1923, unilaterally declared independence on 11 November 1965, and was thereafter an unrecognized state until 1979.
Source: Wikipedia — Prime Minister of Rhodesia (CC BY-SA 4.0)