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.
Colombian Constitution of 1991
The President is directly elected to a four-year term in a two-round election. The 1991 Constitution originally limited the President to a single, non-renewable lifetime term, but a controversial 2004 constitutional amendment supported by then-President Álvaro Uribe permitted a President to serve two terms. This provision allowed President Uribe and his successor, Juan Manuel Santos, to successfully seek second terms in 2006 and 2014 respectively. In 2015, a constitutional amendment repealed the 2004 changes and reverted to the original one-term limit.