Hey, remember when that spoiled rich brat William got married to a slightly-less-super-rich woman named Kate in a ridiculously over-the-top wedding and everyone acted like it was some cute fairy tale?
Well, a while ago, they found the skeleton of one of the people that William's ancestors had to murder in order to become all royal and distinguished.
"...There was also evidence of humiliation injuries, including a pelvic wound likely to have been caused by an upward thrust of a weapon, through the buttock."
That's right, William's ancestor Henry got on the throne by shoving swords into people's buttocks (note: this isn't the rapist serial killer Henry, it's his dad).