25 June
253 – Rome – Lucius I became Pope. https://en.wikipedia.org/wiki/Pope_Lucius_I
524 – France – Battle of Vézeronce. https://en.wikipedia.org/wiki/Battle_of_V%C3%A9zeronce
841 – France – Battle of Fontenoy (Carolingian Civil War). https://en.wikipedia.org/wiki/Battle_of_Fontenoy_(841)
1243 – Rome – Sinibaldo Fieschi became Pope Innocent IV. https://en.wikipedia.org/wiki/Pope_Innocent_IV
1658 – Jamaica – Battle of Rio Neuvo (Anglo-Spanish War). https://en.wikipedia.org/wiki/Battle_of_Rio_Nuevo
1678 – Italy – Elena Cornaro Piscopia became first woman to be awarded a doctorate of philosophy at University of Padua. https://en.wikipedia.org/wiki/Elena_Cornaro_Piscopia
1788 – USA – Virginia became 10th State. http://www.50states.com/facts/virginia.htm#.VYvuWZXbLcs
1876 – USA – Battle of the Little Bighorn. http://www.eyewitnesstohistory.com/custer.htm https://en.wikipedia.org/wiki/Battle_of_the_Little_Bighorn
1883 – UK – Earthquake measuring 4.2Mw, epicentre in Launceston, Cornwall.
1895 – UK – Robert Gascoyne-Cecil, 3rd Marquess of Salisbury became Prime Minister (Conservative). https://www.gov.uk/government/history/past-prime-ministers/robert-gascoyne-cecil
1900 – China – The Dunhuang Manuscripts discovered in Mogao Caves, Dunghuang. http://www.silkroadfoundation.org/newsletter/vol3num2/2_whitfield.php
1935 – USSR – Established diplomatic relations with Colombia.
1938 – Ireland – Dr Douglas Hyde became President. https://en.wikipedia.org/wiki/Douglas_Hyde
1940 – France – Operation Ariel ended (WWII). https://en.wikipedia.org/wiki/Operation_Ariel
1941 – Finland, Karelia, Murmansk – Continuation War began (WWII). https://en.wikipedia.org/wiki/Continuation_War
1941 – Germany – RAF bombers attacked Ruhr & Rhineland industrial areas (WWII).
1942 – Germany – RAF bombers attacked Bremen (WWII). http://ww2db.com/battle_spec.php?battle_id=55/Bombing-of-Hamburg-Dresden-and-Other-Cities-World-War-II-Database
1943 – USA – US Navy plane crashed near Jacksonville-NAS Lee Field, FL, 13 killed (WWII). http://aviation-safety.net/database/record.php?id=19430625-0
1943 – South Africa – RAF plane crashed at Lucia Bay, 8 killed (WWII). http://aviation-safety.net/database/record.php?id=19430625-1
1943 – Poland – Czestochowa Ghetto Uprising began (WWII). https://en.wikipedia.org/wiki/Cz%C4%99stochowa_Ghetto_Uprising
1944 – Finland – Battle of Tali-Ihantala began (Continuation War – WWII). https://en.wikipedia.org/wiki/Battle_of_Tali-Ihantala
1950 – Korea – Korean War began. https://en.wikipedia.org/wiki/Korean_War
1952 – UK – RAF plane crashed off Berwick-upon-Tweed, 11 killed. http://aviation-safety.net/database/record.php?id=19520625-0
1952 – USA – USAF plane crashed near Monrovia, CA, 7 killed. http://aviation-safety.net/database/record.php?id=19520625-2
1955 – India – Two IAF planes crashed at Agra, 19 killed. http://aviation-safety.net/database/record.php?id=19550625-0
1975 – Mozambique – Independence from Portugal. http://www.bbc.co.uk/news/world-africa-13890416
1993 – Canada – Kim Campbell became first female Prime Minister. https://en.wikipedia.org/wiki/Kim_Campbell
1996 – Saudi Arabia – Bombing of Khobar Towers, 19 killed. https://en.wikipedia.org/wiki/Khobar_Towers_bombing
2007 – Cambodia – PMT Air Flight 241 crashed at Phnom Manrey, 22 killed. http://aviation-safety.net/database/record.php?id=20070625-0
York
1877 – Railway Station outside city walls opened. http://www.historyofyork.org.uk/themes/victorian/york-railway-station