The negotiations which led to the Lancaster House Agreement brought recognised independence to Rhodesia (as the Republic of Zimbabwe) following Ian Smith's Unilateral Declaration of Independence in 1965. The Agreement covered the Independence Constitution, pre-independence arrangements, and a ceasefire. The parties represented during the conference were: the British Government, the Patriotic Front led by Robert Mugabe and Joshua Nkomo, ZAPU (Zimbabwe African Peoples Union) and ZANU (Zimbabwe African National Union) and the Zimbabwe Rhodesia government, represented by Bishop Abel Muzorewa and Ian Smith. It was signed on 21 December 1979.
Following the Meeting of Commonwealth Heads of Government held in Lusaka from 1–7 August 1979, the British government invited Muzorewa and the leaders of the Patriotic Front to participate in a Constitutional Conference at Lancaster House. The purpose of the Conference was to discuss and reach agreement on the terms of an Independence Constitution, to agree on the holding of elections under British authority, and to enable Zimbabwe Rhodesia to proceed to lawful and internationally recognised independence, with the parties settling their differences by political means.
Lord Carrington, Foreign and Commonwealth Secretary of the United Kingdom, chaired the Conference. The conference took place from 10 September-15 December 1979 with 47 plenary sessions.