Booze cruise gone wrong or the sinking that screwed the English succession?

In late November 1120, the White Ship sank in the English Channel. Among the dead was King Henry I’s only legitimate son, and heir to the English throne, William Ætheling. Come aboard for a tale involving drunken sailors, an oblivious bishop, some pissed-off priests, Zippy from Rainbow, and an ultimately life-saving bout of diarrhoea.

Warning: The Bayeux Tapestry gets mentioned again, and good luck distinguishing all the people named Matilda and William.