George Washington
At the end of his second term, Washington retired for personal and political reasons, fatigued and disgusted with personal attacks, and to assure a truly contested presidential election could be held. He did not feel bound to a two-term limit, but his retirement ultimately set precedent. The two-term limit to the presidency was formalized with the 1951 adoption of the Twenty-second Amendment to the United States Constitution. Washington is often credited with setting the principal of a two-term presidency, but it was Thomas Jefferson who first refused to run for a third term on political grounds.
Fourth inauguration of Franklin D. Roosevelt
The fourth inauguration of Franklin D. Roosevelt as President of the United States was held on Saturday, January 20, 1945. The inauguration marked the commencement of the fourth term of Franklin D. Roosevelt as president and the only term of Harry S. Truman as Vice President. This was the first and only time a president has been inaugurated for a fourth term. (The Twenty-second Amendment to the United States Constitution, ratified in 1951, limits the number of times a person can be elected president to two.) Roosevelt died days into this term, and Truman succeeded to the presidency.