Twenty-second Amendment to the United States Constitution
The amendment prohibits any individual who has been elected president twice from being elected again. Under the amendment, an individual who fills an unexpired presidential term lasting greater than two years is also prohibited from winning election as president more than once. Scholars debate whether the amendment prohibits affected individuals from succeeding to the presidency under any circumstances or whether it only applies to presidential elections.
President of Italy
The 1948 Constitution does not put any term limit on the presidency, although until 2013 no President ever ran for a second term. On 20 April 2013, President Giorgio Napolitano agreed to run for a second term in an attempt to break the parliamentary deadlock in the 2013 presidential elections and was duly re-elected that same day. However, he made it clear that he would not serve his full term and retired in January 2015.