History of the prime minister of the United Kingdom

The position of Prime Minister of the United Kingdom was not created as a result of a single action; it evolved slowly and organically over three hundred years due to numerous Acts of Parliament, political developments, and accidents of history. == Foundations == For the various personages who presided over the government of England and subsequently Great Britain at the pleasure of the monarch, usually with said monarch's permission, prior to the government under Robert Walpole as prime minister in 1721, see List of English chief ministers.

Source: Wikipedia — History of the prime minister of the United Kingdom (CC BY-SA 4.0)