What man was the only one serve two full four year terms as president of The US?

Franklin D. Roosevelt was the only man to serve two full four-year terms as President of the United States, holding office from 1933 to 1945. He was elected to a third term in 1940 and a fourth term in 1944, making him the only president to serve more than two terms. His unprecedented tenure led to the ratification of the 22nd Amendment in 1951, which officially limited presidents to two terms in office.