Wikipedia:Selected anniversaries/March 15

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 * 856 – Byzantine emperor Michael III (pictured) overthrew the regency of his mother Theodora to assume power for himself.
 * 1147 – Reconquista: Portuguese troops under King Afonso I captured the city of Santarém from the Almoravids.
 * 1311 – In the Battle of Halmyros, the Catalan Company defeated the forces of Walter V, Count of Brienne, taking control of the Duchy of Athens, a Crusader state in present-day Greece.
 * 1783 – George Washington delivered a speech to Continental Army officers in Newburgh, New York, asking them to support the supremacy of the Congress of the Confederation, defusing a potential coup.
 * 1875 – John McCloskey, the Roman Catholic archbishop of New York, was created the first cardinal from the United States.
 * 1910 – Prospectors drilled into a pressurized deposit within the Midway-Sunset Oil Field in California, resulting in the largest accidental oil spill in history, which eventually released 9 million barrels (9 e6oilbbl) of crude oil over 18 months.
 * 1921 – Talaat Pasha, the main perpetrator of the Armenian genocide, was assassinated by Soghomon Tehlirian.
 * 1927 – In rowing, Oxford defeated Cambridge in the inaugural edition of the Women's Boat Race.
 * 1943 – World War II: German forces recaptured Kharkov after four days of house-to-house fighting against Soviet troops, ending the month-long Third Battle of Kharkov.
 * 1956 – The musical My Fair Lady, based on George Bernard Shaw's play Pygmalion, debuted at the Mark Hellinger Theatre in New York City.
 * 1960 – Students from Atlanta University Center, inspired by similar actions in Greensboro, North Carolina, began occupying lunch counters in Atlanta, Georgia.
 * 1974 – Transvestism and Transsexuality in Modern Society, the UK's first trans-rights conference, opened with an evening reception in Leeds.
 * 1990 – Iraqi authorities hanged Iranian freelance reporter Farzad Bazoft on charges of spying for Israel.
 * Born/died: | Ernulf |d|1124| Eusebio Kino |d|1711| Daniele Comboni |b|1831|  Johan Vaaler |b|1866| Arthur Compton |d|1962| Robin Hunicke |b|1973| Lauren Ebsary |b|1983| Paul Pogba |b|1993