What happened on April 20 ?

1176 - Richard de Clare, 2nd Earl of Pembroke, English soldier (b. 1130)

1314 - Pope Clement V (b. 1264)

1521 - Zhengde, Emperor of China (b. 1491)

1534 - Elizabeth Barton, English nun (executed)

1558 - Johannes Bugenhagen, German reformer (b. 1485)

1643 - Christoph Demantius, German composer (b. 1567)

1703 - Lancelot Addison, English royal chaplain (b. 1632)

1765 - Abigail Williams, American accuser in the Salem witch trials (b. 1674)

1769 - Pontiac, Chief of the Ottawa

1831 - John Abernethy, English surgeon (b. 1764)

1887 - Muhammad Sharif Pasha, Egyptian statesman (b. 1826)

1873 - William Tite, English architect (b. 1798)

1899 - Joseph Wolf, German artist (b. 1820)

1912 - Bram Stoker, Irish author (b. 1847)

1918 - Karl Ferdinand Braun, German physicist, Nobel Prize laureate (b. 1850)

1932 - Giuseppe Peano, Italian mathematician (b. 1858)

1947 - King Christian X of Denmark (b. 1870)

1951 - Ivanoe Bonomi, Prime Minister of Italy (b. 1873)

1982 - Archibald MacLeish, American poet and Librarian of Congress (b. 1892)

1984 - Hristo Prodanov, Bulgarian mountaineer (b. 1943)

1991 - Steve Marriott, British musician and actor (b. 1945)

1991 - Don Siegel, American film director (b. 1912)

1992 - Benny Hill, British comedian (b. 1924)

1993 - Cantinflas, Mexican comedian and actor (b. 1911)

1994 - Jean Carmet, French actor (b. 1920)

1996 - Christopher Robin Milne, son of A.A. Milne (b. 1920)

1999 - Victims of the Columbine High School massacre

1999 - Rick Rude, American professional wrestler (b. 1958)

1999 - Señor Wences, Spanish ventriloquist and comedian (b. 1896)

2001 - Giuseppe Sinopoli, Italian conductor and composer (b. 1946)

2002 - Alan Dale, American singer (b. 1925)

2003 - Ruth Hale, American playwright and actress (b. 1908)

2003 - Bernard Katz, German-born biophysicist, recipient of the Nobel Prize in Physiology or Medicine (b. 1911)

2005 - Fumio Niwa, Japanese novelist (b. 1904)

2005 - Zygfryd Blaut, Polish football player (b. 1943)

2006 - Anna Svidersky, Vancouver Teen View news article(b. 1988)