April 21 is the 111st day of the year (112nd in leap years) according to the Gregorian calendar. There are 254 days remaining until the end of the year.

Railways

April 21, 1913 The Ottoman Government made some concessions to remove Britain's opposition to the Baghdad Railway.
21 April 2018 Gaziantep's rail system, GAZİRAY, was laid

Events

753 BC – Romulus and Remus founded Rome.
1821 – Grand Vizier Benderli Ali Pasha resigned and was executed on 30 April. Benderli Ali Pasha was the last known Grand Vizier to be executed by order of the Sultan.
1408 – The Battle of Serrud took place between the Karakoyunlu and Timurids on April 21.
1920 – Mustafa Kemal Pasha issued a circular declaring that the Assembly would be opened on April 23, 1920.
1930 – A fire in a prison in Columbus, Ohio, kills 320.
1939 – Hatay was included in the Turkish Customs Tariff.
1939 – The San Jacinto Monument, the world's tallest concrete monumental column, was inaugurated in the US state of Texas.
1944 – Women get the right to vote in France.
1952 – With the agreement signed between Turkey and Greece, visa formalities were abolished.
1956 – by Elvis Presley Heartbreak hotel name song, Billboard It was his first work to reach #1 in the magazine.
1957 – Muhsin Ertuğrul was appointed head of the Istanbul Municipality City Theatres.
1960 - Brasília officially becomes the capital of Brazil. The former capital was Rio de Janeiro.
1964 – Deputy Greek Patriarch Emilyanos and Metropolit Canavaris were deported on the grounds that they were operating against Turkey.
1964 – Greece agreed to place its military contingent in Cyprus under the command of the United Nations Peacekeeping Force.
1967 – Coup in Greece. The "Colonels' Junta" led by Yorgo Papadopoulos seized power, and the military regime that would last for seven years began.
1968 – The United States, United Kingdom, and Russia sign a treaty to rescue astronauts in distress.
1970 – The Principality of Hutt River Province declared independence from Australia.
1975 – Vietnam War: South Vietnamese President Nguyen Van Thieu leaves Saigon.
1979 – The Romanian flagged Karpati freighter and the iron-laden Kemal Kefeli coaster collided in the Bosphorus. The Turkish ship sank with 17 crew, the bodies of two sailors were found, five people were lost. The Romanian freighter was caught by the police motor while fleeing.
1987 – A bomb-laden vehicle exploded in Colombo, the capital city of Sri Lanka. 113 people died.
1994 - The first extrasolar planets were discovered by Polish astronomer Alexander Wolszczan.
2003 – After the fall of Saddam Hussein's rule in Iraq, the Coalition Provisional Administration ruled the country until 28 June 2004.
2004 – Mordechai Vanunu is released from prison after 18 years in Israel. He was arrested again on 20 November 2005 for allegedly entering the Palestinian territories illegally and violating the terms of his release. Moroccan physicist Vanunu had disclosed Israel's secret nuclear work in 1986 with documents and photographs.
2005 – GNAT Presidency Council, GNAT 85th Anniversary National Sovereignty Honor Award to Prof. Dr. He decided to give it to Gazi Yaşargil.
2008 – The United States Air Force decommissioned the F-117 Nighthawk, also known as the "Night Hawk", which went undetected.
2011 – 15 people lost their lives in the attack on the Oktyabrskaya station of the metro system in Minsk, the capital of Belarus.
2014 – The city of Flint, Michigan, USA, changed its drinking water source to the Flint River, and the Flint water crisis began due to high levels of lead in the water.

Births

1488 – Ulrich von Hutten, German philosopher and poet (d. 1523)
1652 – Michel Rolle, French mathematician (d. 1719)
1671 – John Law, Scottish economist and author (d. 1729)
1774 – Jean-Baptiste Biot, French physicist (d. 1862)
1790 – Manuel Blanco Encalada, first President of Chile (d. 1876)
1816 - Charlotte Brontë, English writer (Jane Eyre famous for his work) (d. 1855)
1828 Hippolyte Taine, French historian (d. 1893)
1837 – Fredrik Bajer, Danish author, teacher, pacifist politician, and Nobel Peace Prize laureate (d. 1922)
1838 – John Muir, influential Scottish-American naturalist, author, environmental philosopher, botanist, zoologist, glaciologist (d. 1914)
1864 – Max Weber, German social scientist (d. 1920)
1882 – Percy Williams Bridgman, American physicist and Nobel Prize laureate in Physics (d. 1961)
1889 – Paul Karrer, Swiss organic chemist (d. 1971)
1889 – Efrem Zimbalist, Russian violin virtuoso, composer and orchestra director (d. 1985)
1904 – Odilo Globocnik, Austrian Nazi and later SS leader (d. 1945)
1911 – Kemal Satır, Turkish physician and politician (former General Secretary of the CHP) (d. 1991)
1913 – Sami Ayanoğlu, Turkish theater, film actor, director, screenwriter and producer (d. 1971)
1913 – Sevket Rado, Turkish journalist and writer (d. 1988)
1915 – Anthony Quinn, American actor and winner of the Academy Award for Best Supporting Actor (d. 2001)
1919 – Licio Gelli, Italian financier, freemason, and crime syndicate leader (d. 2015)
1922 – Nazım Kıbrısî, Turkish mystic and sheikh of the Naqshbandi Order (d. 2014)
1923 – Bahaeddin Ögel, Turkish history professor (d. 1989)
1926 – II. Elizabeth, Head of the Commonwealth of Nations and Queen of England (d. 2022)
1928 – Andrew Walls, British myologist (d. 2021)
1930 – Silvana Mangano, Italian film actress and model (d. 1989)
1930 – Jack Taylor, English football referee (d. 2012)
1932 – Elaine May, American comedian, film director, screenwriter, playwright and actress
1932 - Angela Mortimer, English tennis player
1935 – Charles Grodin, American actor, comedian, author, and former television host (d. 2021)
1941 – Ryan O'Neal, American actor (d. 2023)
1943 – Philippe Séguin, French politician (d. 2010)
1947 – Barbara Park, American author (d. 2013)
1947 – Iggy Pop, American musician, singer, songwriter, drummer, and actor
1949 – Patti LuPone, American actress and singer
1951 – Tony Danza, American actor
1952 – Cheryl Gillan, British politician (d. 2021)
1954 – James Morrison, American actor
1955 – Murathan Mungan, Turkish playwright and poet
1955 – Kris Kelmi, Soviet-Russian musician and composer (d. 2019)
1957 – Hervé Le Tellier, French writer
1958 - Andie MacDowell is an American actor.
1959 – Robert Smith, English guitarist and vocalist
1959 – Ayşe Sucu, Turkish journalist and writer
1961 – Ulvi Arı, Turkish mime artist, actress and writer
1963 – Behzat Uygur, Turkish theater, TV series and film actor
1969 – Toby Stephens, English stage, film and television actor
1971 – Nebil Sayin, Turkish actress
1975 – Olivia Magnani, Italian actress and singer
1979 – James McAvoy, Scottish actor
1979 – Tobias Linderoth, Swedish football player
1983 – Marco Donadel, Italian football player
1988 - Robert Patrick "Robbie" Amell, Canadian actor
1989 – Nikki Cross, Scottish professional wrestler
1990 – Tunay Torun, German-Turkish football player
1992 – Botond Baráth, Hungarian football player
1992 – Deng Linlin, Chinese gymnast
1992 – Francisco Román Alarcón Suárez or Isco for short, Spanish national football player
1993 – Bruno Gaspar, Portuguese football player
1994 – Erten Ersu, Turkish football player

Deaths

43 BC – Aulus Hirtius, Roman consul immediately after Julius Caesar (90 BC)
599 – Anastasius I of Antioch, Patriarch of Antioch
866 – Bardas, Byzantine noble and high minister
1109 – Anselm of Canterbury, Benedictine monk, philosopher, and theologian known for his ontological proof of God's existence (b. 1033)
1142 – Pierre Abélard, French writer and philosopher (b. 1079)
1509 – VII. Henry, King of England (b. 1457)
1574 – Cosimo I, II of the Duchy of Florence of the Medici Dynasty. Duke and Ist Grand Duke of the Grand Duchy of Tuscany (b. 1519)
1591 – Sen no Rikyū, a Japanese tea master (b. 1522)
1699 – Jean Racine, French poet and playwright (b. 1639)
1736 – Prince Eugen of Savoy, Austrian general (b. 1663)
1793 – John Michell, English natural philosopher and pastor (b. 1724)
1825 – Johann Friedrich Pfaff, German mathematician (b. 1765)
1866 – Jane Welsh Carlyle, Scottish author (b. 1801)
1910 – Mark Twain, American novelist and humorist (b. 1835)
1918 – Manfred von Richthofen (Red Baron), German pilot (b. 1892)
1938 – Mohammed Iqbal, Pakistani poet (b. 1877)
1945 – Walter Model, German field marshal (b. 1891)
1946 – John Maynard Keynes, English economist (b. 1883)
1952 – Stafford Cripps, British Labor Party politician, lawyer and diplomat (b. 1889)
1965 – Edward Victor Appleton, English physicist and Nobel Prize laureate in Physics (b. 1892)
1966 – Josef Dietrich, German Waffen-SS general (b. 1892)
1971 – François Duvalier, President of Haiti (b. 1907)
1973 – Kemal Tahir, Turkish writer (b. 1910)
1980 – Alexander Oparin, Soviet biochemist (b. 1894)
1980 – Sohrab Sepehri, Iranian modern poet and painter (b. 1928)
1985 – Tancredo de Almeida Neves, Brazilian politician (b. 1910)
1996 – Cahar Dudayev, Chechen commander (b. 1944)
1998 – Jean-François Lyotard, French philosopher (b. 1924)
2003 – Nina Simone, American singer, pianist, and human rights activist (b. 1933)
2006 – Telê Santana, Brazilian football player and manager (b. 1931)
2010 – Juan Antonio Samaranch, Spanish sportsman (b. 1920)
2011 – Harold Garfinkel, American sociologist and philosopher (b. 1917)
2011 – Sofía Silva Inserri, Venezuelan model (b. 1929)
2013 – Chrissy Amphlett, Australian singer (b. 1959)
2015 – John Moshoeu, South African football player (b. 1965)
2016 – Prince, American musician (b. 1958)
2017 – Enrico Medioli, Italian screenwriter (b. 1925)
2018 – Verne Troyer, American actor, comedian, and stunt performer (b. 1969)
2019 – Hannelore Elsner, German actress and fashion designer (b. 1942)
2019 – Steven Golin, American film and television producer (b. 1955)
2019 – Ken Kercheval, American actor (b. 1935)
2020 – Abdurrahim El-Keib, Libyan politician (b. 1950)
2020 – Donald Kennedy, American scientist, journalist, bureaucrat, and academic (b. 1931)
2020 – Teruyuki Okazaki, Japanese karate (b. 1931)
2020 – Jacques Pellen, French jazz guitarist (b. 1957)
2020 – Laisenia Qarase, Fijian politician (b. 1941)
2020 – Florian Schneider-Esleben, German electronic dance music artist and pop singer (b. 1947)
2021 – Mercedes Colás de Meroño, Argentine human rights activist (b. 1925)
2021 – Myriam Colombi, French theater, film and television actress (b. 1940)
2021 – Thomas Fritsch, German actor and voice actor (b. 1944)
2021 – Marian Kosiński, Polish professional football player and manager (b. 1945)
2021 – Lea Dali Lion, Estonian singer, musician and songwriter (b. 1974)
2021 – Joe Long, American musician (b. 1932)
2021 – Annie Steiner, Algerian female activist (b. 1928)
2022 – Renate Holm, German-Austrian actress and opera singer (b. 1931)
2022 – Aydın İlter, Turkish soldier (b. 1930)
2022 – Mwai Kibaki, third president of the Republic of Kenya (b. 1931)
2022 – Jacques Perrin, French actor, filmmaker and director (b. 1941)
2022 – Cynthia Plaster Caster, American sculptor (b. 1947)
2023 – Trilochan Kanungo, Indian politician (b. 1940)

Holidays and special occasions

Baha'i - the first day of the Ridvan festival
Storm: The Beginning of Sitte-i Sevr