Who was the first prime minister of Britain?

Robert Walpole was the first prime minister of Britain. Robert Walpole known before 1742 as Sir Robert Walpole, was a British statesman who is generally regarded as having been the first Prime Minister of Great Britain. Although the position of “Prime Minister” had no recognition in law or official use at the time, Walpole is nevertheless acknowledged as having held the office de facto because of his influence within the Cabinet.