Only one US President has ever served a third term and that was Franklin Delano Roosevelt. That didn’t stop other Presidents from trying however. Ulysses Grant sought a third term but lost as well as Grover Cleveland. Woodrow Wilson also attempted it, even viciously blocking the nomination of his son-in-law at the convention to try for a third term. Because of these actions and the American peoples fear of a monarchy emerging, the Twenty-Second amendment was adopted. The amendment passed in 1947 and limited the time a president may serve to two terms. No more would there be a threat of a President turning into a King.