When William II died in 1100, he was survived by two of his brothers, his elder brother Robert Curthose, and younger brother Henry, who seized the throne while Robert was away on the First Crusade. The following year, Robert invaded to claim the crown for himself, but was temporarily pacified through the Treaty of Alton, whereby Henry agreed to pay him an annual sum of 30,000 marks to return to Normandy. In 1106, Henry decided to eliminate any threat from Robert by invading Normandy himself. The ultimately decisive battle took place in the small village of Tinchebray, on 28th September, almost exactly 40 years after their father's conquest of England in the Battle of Hastings. The battle only lasted an hour, and Robert himself was …
Editors. "Battle of Tinchebray". The Literary Encyclopedia. First published 31 July 2012; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=1952, accessed 26 April 2015.]