How did King Harold die and how do you know this?

Answer 1

an account of harolds death written by a french bishop just 2 years after the battle-well before the bayeux was tapestry was embroided"with the point of his lance the first knight pierced harolds shield and chest, drenching the ground with blood. With his sword the second knight cut off his head. the third dissembowelled him with his javelin.the fourth hacked off his leg."

150 years later this was written

"Harold fell his brain pierced by an arrow."