A double referendum was held in Rhodesia on 20 June 1969, in which voters were asked whether they were in favour of or against a) the adoption of a republican form of government and b) the proposals for a new Constitution, as set out in a White Paper and published in a Gazette Extraordinary on 21 May 1969. Both proposals were approved. The country was subsequently declared a republic on 2 March 1970.
On 11 November 1965, the self-governing British colony of Southern Rhodesia made a Unilateral Declaration of Independence (UDI) although it continued to recognise the British monarch, Queen Elizabeth II, as head of state, with oaths of allegiance to "Her Majesty the Queen Elizabeth, Queen of Rhodesia, her heirs and successors".
However, the Rhodesian Front government of Ian Smith ceased to recognise the authority of her de jure representative, the Governor Sir Humphrey Gibbs. Instead, on 17 November, it appointed former Deputy Prime Minister Clifford Dupont to the post of "Acting Officer Administering the Government".
On 2 December, Smith wrote a personal letter to the Queen, asking her to accept Dupont as the new Governor-General. In response, he was told that "Her Majesty is not able to entertain purported advice of this kind, and has therefore been pleased to direct that no action shall be taken upon it".