Wikipedia:Selected anniversaries/April 4

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 * 1268 – The Byzantine Empire and the Republic of Venice signed a five-year peace treaty.
 * 1841 – William Henry Harrison (pictured) became the first U.S. president to die in office, sparking a brief constitutional crisis regarding questions of presidential succession that were unanswered by the U.S. Constitution.
 * 1873 – The Kennel Club, the world's oldest kennel club, was founded in the United Kingdom after Sewallis Shirley became frustrated by trying to organise dog shows without a consistent set of rules.
 * 1905 – An earthquake hit the Kangra Valley in India, killing at least 20,000 people and destroying 100,000 buildings.
 * 1968 – American civil rights leader Martin Luther King Jr. (pictured) was assassinated in Memphis, Tennessee.
 * 1973 – A year after the completion of the second of the complex's twin towers, the World Trade Center in New York City was officially dedicated.
 * 1975 – Bill Gates and Paul Allen founded Microsoft in Albuquerque, New Mexico, to develop and sell BASIC interpreters for the Altair 8800.
 * 1975 – Vietnam War: On a mission to evacuate children from South Vietnam, a U.S. Air Force plane crash-landed at Tan Son Nhut Air Base, killing 78 children and 60 others.
 * 1988 – Evan Mecham, Governor of Arizona, was removed from office after being convicted in his impeachment trial.
 * 2013 – A building collapsed on tribal land in Thane in Maharashtra, India, causing 74 deaths.
 * Born/died this day: | Liu Yin |d|911| Robert III of Scotland |d|1406| Elena Glinskaya |d|1538| William Strachey |b|1572| Jean-Pierre Saint-Ours |b|1752| Philippa Fawcett |b|1868|Pierre Monteux |b|1875| Maurice de Vlaminck |b|1876| Isaac K. Funk |d|1912|  Maya Angelou |b|1928 |Jonathan Agnew |b|1960| Karen Spärck Jones |d|2007| Roger Ebert |d|2013