Leonora Knatchbull was the daughter of Countess Mountbatten (Father) & Nortan Knatchbull (Mother). she died at the age of 5 years due to cancer.
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In the year 1990, her parents found that Leonora was ill and have cancer. For 14 months Leonora regularly visits Diana Hospital for treatment.
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Leonora Knatchbull died due to kidney cancer on 22 October 1991 at the age of 5 years. She lived with her parents in Broadlands, Hampshire.
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According to news channels, she did her treatment at Diana Hospital. She suffered from multiple treatments. Her funeral was held at Romsey Abbey on 26th October 1991.
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Fifth Season on Netflix. Leonora Knatchbull's character is played by Lady Romsey in the Crown 5th Season of Netflix. Viewers can watch this season on Netflix.