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Mar 8, 1399
The rivalry between the house of York and the House of Lancaster started when King Richard II was overthrown by his cousin, Henry Bolingbroke, Duke of Lancaster, in 1399.
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Mar 8, 1413
Henry IV ("Bolingbroke," son of the Duke of Lancaster), 1399-1413.
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Mar 8, 1422
Henry V (son of Henry IV), 1413-1422.
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May 22, 1455
But the Wars of the Roses actually began on May 22nd, 1455 with First Battle of St. Albans when Richard, Duke of York and his ally, Richard, Earl of Warwick defeated the Lancastrians under Edmund Beaufort who was killed. York captured Henry VI.
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Mar 8, 1471
Henry VI (son of Henry V, deposed), 1422-1471.
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Mar 8, 1483
Edward IV (son of duke of York), 1461-1483.
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Mar 8, 1483
Edward V (son of Edward IV), 1483.
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Mar 8, 1485
Richard III ("Crookback," brother of Edward IV) 1483-1485