Who was on the throne when Britain's first Prime Minister, Robert Walpole, was appointed?

Question

Who was Prime Minister of the UK on 28 March 1979, when the House of Commons passed a Motion of No Confidence, forcing a general election that was won by Margaret Thatcher?

Answer 1

George I
The term "Prime Minister" was not used formally until 1878 and not officially given recognition in the order of precedence until 1905, but it was regularly, if informally, used of Walpole by the 1730s.