Prince William made a heartbreaking promise to mum Princess Diana after finding her sobbing in a bathroom.As a 10-year-old, the Duke of Cambridge, now 38, vowed to give his mum her royal title back when he became king after her marriage to Prince Charles ended.According to OK!, after finding her sobbing, the young prince also stuffed tissues under the door as Diana sobbed, saying "I hate to see you sad.""Don’t worry, Mummy, I will give it back to you one day when I am King," he added.Later, Diana is understood to have confided in a friend that William was "an extraordinary moral support" and he promised to always look after her.Diana's divorce from Prince Charles in 1996 can be counted as one of the year's, if not the decade's, biggest.
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