30 April
313 – Roman Empire – Battle of Tzirallum (Civil War of Tetrarchy). https://en.wikipedia.org/wiki/Battle_of_Tzirallum
424BC – Greece – Partial eclipse of sun observed. http://www.phenomena.org.uk
1045 – Rome – Pope Benedict IX resigned (Second Term). https://en.wikipedia.org/wiki/Pope_Benedict_IX
1513 – England – Edmund de la Pole (Yorkist pretender to the throne) executed. http://www.luminarium.org/encyclopedia/edmunddelapole.htm
1517 – England – Evil May Day riot in London began. https://en.wikipedia.org/wiki/Evil_May_Day
1557 – Chile – Battle of Mataquito (Arauco War). http://en.wikipedia.org/wiki/Battle_of_Mataquito
1636 – Germany – Siege of Schenkenschans ended (Eighty Years’ War). https://en.wikipedia.org/wiki/Siege_of_Schenkenschans
1655 – Hispaniola – Siege of Santo Domingo ended (Anglo-Spanish War). https://en.wikipedia.org/wiki/Siege_of_Santo_Domingo_(1655)
1781 – USA – Battle of Fort Royal ended (American Revolutionary War). https://en.wikipedia.org/wiki/Battle_of_Fort_Royal
1789 – USA – George Washington became President. https://www.whitehouse.gov/1600/presidents/georgewashington
1803 – USA – Louisiana Territory purchased from France. http://www.history.com/topics/louisiana-purchase
1812 – USA – Louisiana became 18th State. http://www.50states.com/louisian.htm
1863 – Mexico – Battle of Camarón (French Intervention in Mexico). http://www.burnpit.us/2013/04/battle-camar%C3%B3n-these-are-not-men-they-are-devils
1863 – USA – Camp Grant Massacre. http://en.wikipedia.org/wiki/Camp_Grant_massacre
1863 – USA – Battle of Chancellorsville began (American Civil War). http://www.civilwar.org/battlefields/chancellorsville.html
1885 – USA – Niagara Reservation created.https://tclf.org/landscapes/niagara-reservation https://archive.org/details/howniagarawasmad00welcuoft
1900 – USA – Jonathan Luther ‘Casey’ Jones died in train crash. https://youtu.be/wvfCGlXRYAA http://en.wikipedia.org/wiki/Casey_Jones
1904 – USA – Louisiana Purchase Exposition World Fair opened. https://youtu.be/IrwIi_CenxY http://www.mohistory.org/exhibits/Fair/WF/HTML/Overview/
1914 – USA – Second Coxey’s Army protest march reached Washington. https://en.wikipedia.org/wiki/Coxey%27s_Army#Second_march
1927 – USA – Federal Industrial Institute for Women opened in Alderson, West Virginia. http://en.wikipedia.org/wiki/Federal_Prison_Camp,_Alderson
1938 – Italy – Ala Littoria plane crashed at Maranola, Formia, 19 killed. http://aviation-safety.net/database/record.php?id=19380430-0
1938 – UK – First televised FA Cup Final. https://youtu.be/LdK9ObH6ayg http://www.live-footballontv.com/history-of-football-on-tv-uk.html
1939 – USA – New York World Fair opened. https://youtu.be/WIouMYBXySc http://1939nyworldsfair.com/worlds_fair/wf_tour/index.htm
1941 – Greece – Battle of Greece ended (WWII). https://en.wikipedia.org/wiki/Battle_of_Greece
1943 – UK/Spain – Operation Mincemeat (WWII). https://youtu.be/Gh8D3vA1mgk WARNING! Video contains scenes some viewers may find distressing https://en.wikipedia.org/wiki/Operation_Mincemeat
1944 – UK – Exercise Tiger ended (WWII). https://youtu.be/mIbuELErqac http://www.bbc.co.uk/news/uk-england-devon-27185893 )
1944 – South Pacific – US Navy plane crashed, 3 killed (WWII). http://aviation-safety.net/database/record.php?id=19440430-1
1945 – Burma – Battle of Pegu ended (Operation Dracula – WWII). https://en.wikipedia.org/wiki/Operation_Dracula#Battle_for_Pegu
1945 – Germany – POW camp Stalag Luft I liberated. https://youtu.be/YOZvFZZbXWM WARNING! Video contains scenes some viewers may find distressing https://en.wikipedia.org/wiki/Stalag_Luft_I
1945 – USA – USAAF plane crashed near Oklahoma City-Tinker Field, OK, 5 killed (WWII). http://aviation-safety.net/database/record.php?id=19450430-5
1945 – Germany – Battle of Bautzen ended (WWII). https://en.wikipedia.org/wiki/Battle_of_Bautzen_(1945)
1945 – Germany – Adolf Hitler & Eva Braun committed suicide (WWII). https://youtu.be/M86Jwv4iEYw WARNING! Video contains scenes some viewers may find distressing http://en.wikipedia.org/wiki/Death_of_Adolf_Hitler
1946 – India – RAF plane crashed at Pindi-Khut, 12 killed. http://aviation-safety.net/database/record.php?id=19460430-0
1947 – USA – Boulder Dam renamed Hoover dam (2nd time). http://www.pbs.org/wgbh/americanexperience/features/general-article/hoover-controversy/
1947 – Greece – Royal Hellenic Air Force plane crashed at Sedes Air Base, 3 killed. http://aviation-safety.net/database/record.php?id=19470430-2
1951 – North Korea – USAF plane crashed near Wonsan, 6 killed (Korean War). http://aviation-safety.net/database/record.php?id=19510430-0
1952 – India – Deccan Airways plane crashed at Delhi-Safdarjung Airport, 9 killed. http://aviation-safety.net/database/record.php?id=19520430-0
1953 – USSR – Aeroflot plane crashed near Kazan Airport, 1 killed. http://aviation-safety.net/database/record.php?id=19530430-0
1953 – USA – USAF plane crashed near Chicago-O’Hare International Airport, IL, 1 killed. http://aviation-safety.net/database/record.php?id=19530430-1
1953 – USA – Tornado hit Warner Robins, Georgia, 18 killed. https://youtu.be/c_CEseOkv6E https://www.gendisasters.com/georgia/5472/warner-robins,-ga-tornado-kills-nearly-three-score,-may-1953
1954 – India – Darbhanga Aviation plane crashed near Calcutta-Dum Dum Airport, 5 killed. http://aviation-safety.net/database/record.php?id=19540430-0
1956 – UK – Scottish Airlines plane crashed at London-Stansted Airport, 2 killed. http://aviation-safety.net/database/record.php?id=19560430-0
1961 – USSR – K19 nuclear submarine commissioned. http://www.nationalgeographic.com/k19/index.html#
1963 – UK – Bristol Bus Boycott. http://www.bbc.co.uk/news/magazine-23795655
1975 – Vietnam – Operation Frequent Wind ended (Vietnam War). https://youtu.be/N5AiKeXm0Oc WARNING! Video contains scenes some viewers may find distressing https://en.wikipedia.org/wiki/Operation_Frequent_Wind
1975 – South Vietnam – Spring Offensive ended (Vietnam War). https://en.wikipedia.org/wiki/1975_Spring_Offensive
1977 – Cambodia/Vietnam/Thailand – Cambodian-Vietnamese War began (Third Indochina War). https://en.wikipedia.org/wiki/Cambodian%E2%80%93Vietnamese_War
1980 – UK – Iranian Embassy Siege began. https://youtu.be/DI3HY7g0MDU WARNING! Video contains scenes some viewers may find distressing https://en.wikipedia.org/wiki/Iranian_Embassy_siege
1980 – Netherlands – Beatrix became Queen. http://en.wikipedia.org/wiki/Beatrix_of_the_Netherlands
1982 – India – Bijon Setu Massacre. http://en.wikipedia.org/wiki/Bijon_Setu_massacre
2008 – Russia – Skeletal remain found near Yekaterinburg confirmed as Alexei Nikolaevich & Anastasia Nokolaevna. https://youtu.be/Q0bUmHjLof0 WARNING! Video contains scenes some viewers may find distressing https://www.theguardian.com/world/2007/aug/25/russia.lukeharding
2009 – Netherlands – Attempted assassination of Queen Beatrix, 7 killed. http://news.bbc.co.uk/1/hi/8026807.stm
2009 – Azerbaijan – Shooting at State Oil Academy, 12 killed. http://news.bbc.co.uk/1/hi/world/europe/8026194.stm
2012 – India – Ferry Capsized on Brahmaputra River, 103 killed. http://www.theguardian.com/world/2012/may/01/indian-ferry-capsizes-brahmaputra
2013 – Netherlands – Queen Beatrix abdicated, Willem Alexander became King. http://en.wikipedia.org/wiki/Willem-Alexander_of_the_Netherlands
2014 – China – Ürümqi attack, 3 killed. http://www.bbc.co.uk/news/world-asia-china-27225308
York
1649 – John Hollins, William Askwith, Joseph Baines, Thomas Barker, Edward Calvert, Thomas Darley, Henry Cave, William Cropper, James Dallin, John Danby, James Eastwood, William Ellison, Thomas Exley, George Frankish, Elizabeth Thomlinson , Grace Bland, Emma Ribinson, Jane Lickiss, Hannah Meynell, Ellen Nicholson, Isabella Billington and Mr. Billington were executed at Knavesmire Gallows.
1783 – Charles Colwell was executed at Tyburn Gallows.
1992 – Redesigned layout of St. Sampson Square opened.