But as soon as he married his childless wife, he was even more vengeful for the past due to the fact that the marriage was not his best bet so he killed her to save his children. In fact due to his bloodline so it was almost impossible for him to win her hand and she was killed just like anyone who dies in a tv drama. And finally he had the last blow to take England from the Saxon and start a new era for mankind.

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http://www.johnkellerman.com/the-life-of-william-the-conqueror-b100843.html

http://www.huffingtonpost.com/2014/11/08/history/the-story-of-william-the-contquer-the-conqueror/

http://www.telegraph.co.uk

https://en.wikipedia.org/wiki/William_the_conqueror

http://www.cnn.com/2015/09/20/the-most-violent-contquer-in-the-world/