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So, William Adelin died on a ship sinking in 1120 and as the only male heir to Henry I the resulting succession crisis pretty much rocked England to the core so badly that it was known as The Anarchy.
If Adeline survived would this period of English history have been more stable and the line of kings be totally changed? The House of Normandy getting a chance at longer longevity and screwing over the Plantagenets?