Events on January 20 40
Year 250
Emperor Decius begins a widespread persecution of Christians in Rome. Pope Fabian is martyred.
Year 649
King Chindasuinth, at the urging of bishop Braulio of Zaragoza, crowns his son Recceswinth as co-ruler of the Visigothic Kingdom.
Year 1265
The first English parliament to include not only Lords but also representatives of the major towns holds its first meeting in the Palace of Westminster, now commonly known as the "Houses of Parliament".
Year 1356
Edward Balliol surrenders his claim to the Scottish throne to Edward III in exchange for an English pension.
Year 1567
Battle of Rio de Janeiro: Portuguese forces under the command of Estácio de Sá definitively drive the French out of Rio de Janeiro.
Year 1576
The Mexican city of León is founded by order of the viceroy Don Martín Enríquez de Almanza.
Year 1783
The Kingdom of Great Britain signs a peace treaty with France and Spain, officially ending hostilities in the American Revolutionary War.
Year 1785
Invading Siamese forces attempt to exploit the political chaos in Vietnam, but are ambushed and annihilated at the Mekong river by the Tây Sơn in the Battle of Rạch Gầm-Xoài Mút.
Year 1788
The third and main part of First Fleet arrives at Botany Bay. Arthur Phillip decides that Botany Bay is unsuitable for the location of a penal colony, and decides to move to Port Jackson.
Year 1877
The last day of the Constantinople Conference results in agreement for political reforms in the Balkans.
Year 1921
The first Constitution of Turkey is adopted, making fundamental changes in the source and exercise of sovereignty by consecrating the principle of national sovereignty.
Year 1929
In Old Arizona, the first full-length talking motion picture filmed outdoors, is released.
Year 1937
Franklin Delano Roosevelt and John Nance Garner are sworn in for their second terms as U.S. President and U.S. Vice President, the first occasion a Presidential Inauguration to take place on January 20 following the ratification of the 20th Amendment
Year 1941
A German officer is killed in Bucharest, Romania, sparking a rebellion and pogrom by the Iron Guard, killing 125 Jews and 30 soldiers.
Year 1942
World War II: At the Wannsee Conference held in the Berlin suburb of Wannsee, senior Nazi German officials discuss the implementation of the "Final Solution to the Jewish question".
Year 1945
World War II: The provisional government of Béla Miklós in Hungary agrees to an armistice with the Allies.
Year 1945
World War II: Germany begins the evacuation of 1.8 million people from East Prussia, a task which will take nearly two months.
Year 1948
United Nations Security Council Resolution 39 relating to India and Pakistan is adopted.
Year 1949
Point Four Program a program for economic aid to poor countries announced by United States President Harry S. Truman in his inaugural address for a full term as President.
Year 1953
Dwight D. Eisenhower is inaugurated as the 34th President of the United States of America, becoming the first President to begin his presidency on January 20 following the ratification of the 20th Amendment.
Year 1954
In the United States, the National Negro Network is established with 40 charter member radio stations.
Year 1972
Pakistan launched its nuclear weapons program, a few weeks after its defeat in the Bangladesh Liberation War, as well as the Indo-Pakistani War of 1971.
Year 1981
Twenty minutes after Ronald Reagan was inaugurated, Iran releases 52 American hostages.
Year 1986
In the United States, Martin Luther King, Jr. Day is celebrated as a federal holiday for the first time.
Year 1990
The Red Army crackdown on civil protests in Baku, Azerbaijan during the dissolution of the Soviet Union.
Year 1991
Sudan's government imposes Islamic law nationwide, worsening the civil war between the country's Muslim north and Christian south.
Year 1992
Air Inter Flight 148, an Airbus A320-111, crashes into a mountain near Strasbourg, France killing 87 of the 96 people on board.
Year 2001
President of the Philippines Joseph Estrada is ousted in a nonviolent 4-day revolution, and is succeeded by Gloria Macapagal-Arroyo.
Year 2007
Four-man Team N2i, using only skis and kites, completes a 1,093-mile (1,759 km) trek to reach the Antarctic pole of inaccessibility for the first time since 1965 and for the first time ever without mechanical assistance.
Year 2009
A protest movement in Iceland culminates as the 2009 Icelandic financial crisis protests start.
Year 2009
Barack Obama is inaugurated as the 44th President of the United States of America, becoming the first African-American President of the United States.
Year 2017
Donald Trump is inaugurated as the 45th President of the United States of America.