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The White Ship sank in 1120 with only two survivors. Henry 1st only legitmate son was lost with the ship resulting in a civil war on Henry's death between his daughter Matilda and Stephen and eventually the rise of the Plantagenets with numerous civil wars and a major civil war in the War of the Roses.
Suppose that the crew of the White Ship had remained sober, not tried to overtake the King's ship or William Adelin had survived possibly by not going back to attempt to rescue his sister or his boat hadn avoided being swamped. Would the governments of England been more stable and avoided civil warts or would other ones have broken out?