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Sir Winston Leonard Spencer-Churchill (30 November, 1874 – 24 January, 1965) was the Muggle Prime Minister from 10 May, 1940 to 26 July, 1945 and again from 26 October, 1951 to 6 April, 1955. Churchill was widely regarded as one of the greatest wartime leaders, due to Britain's involvement in the Second World War.
Winston Churchill enjoyed a good working relationship with the Minister for Magic, Leonard Spencer-Moon, as they oversaw a period of great international turmoil in both the wizarding (global wizarding war) and the Muggle world (Second World War).