UN & its Secretaries Generals-

The history of the United Nations as an international organization has its origins in World War II. US President Franklin Delano Roosevelt first suggested using the name United Nations to refer to the Allies of World War II. Franklin Roosevelt adopted the name and the first official use of the term occurred on January 1, 1942 with the Declaration by the United Nations.
Name Period Nationality Trygve Halvdan Lie 1946 ― 1952 Norway Dag Hammarskjold 1952 ― 1961 Sweden U Thant 1961 ― 1971 Myanmar Kurt Waldheim 1972 ― 1981 Austria Javier Perez de Cuellar 1982 ― 1991 Peru Boutros Boutros-Ghali 1992 ― 1996 Egypt Kofi Annan 1997 ― 2006 Ghana Ban Ki Moon 2007 ― South Korea