jan 1, 1407 - Royal Family Rivalry Starts War

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A rivalry in the royal family of France results in the murder of Louis Duke of Orleans.

Source:
http://www.historyworld.net/timesearch/default.asp?keywords=hundred+years+of+war&date=&sort2=&bottomsort=&topsort=&direction=&timelineid=&getyear=&viewtext=extended&conid=timeline&event_number=20

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