William died after his horse reared up during a 1087 battle, throwing the king against his saddle pommel so forcefully that his intestines ruptured. An infection set in that killed him several weeks later.
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William the Conqueror's Exploding Corpse - Historic UK.
There is a long history behind the British royal family becoming the one based on the constitutional monarchy. Firstly, a king who united the regions of England emerged around the 9th century.Then, in 1066, William I started the Norman dynasty. This dynasty led to the current British royal family.