Maybe this has been done before... I was watching The Pillars Of The Earth and began to wonder: what if William Atheling, son and heir of Henry I of England, didn't die in 1120 when the White Ship sank and succeeded his father as William III in 1135. No war between Stephen and Mathilda - and, if William has sons, no Plantagnêts on the throne of England.
Any ideas on what William III's reign would have been like?