Catherine FitzCharles explained

Catherine FitzCharles (1658–1759) was the illegitimate daughter of Charles II of England and his mistress Catherine Pegge. Her older brother by one year, Charles FitzCharles, was made the 1st Earl of Plymouth by his father. Little is known about Catherine's life, but she is thought to have become a Benedictine nun at Dunkirk Abbey in Dunkirk, France, like many other highborn Englishwomen during the reign of Charles II. She is believed to have resided there under the religious name, Sister Ophelia, until her death in 1759, aged 101. However, the small amount of information available about her has led some to conclude that she died in infancy or early childhood instead.

References

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• Web site: Lundy . Darryl . The Peerage . Person Page - 10503. September 30, 2015 . September 20, 2015 .
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• Book: Dugdale, William, Sir . The baronage of England, or, An historical account of the lives and most memorable actions of our English nobility in the Saxons time to the Norman conquest, and from thence, of those who had their rise before the end of King Henry the Third's reign deduced from publick records, antient historians, and other authorities . London . William Dugdale . Tho. Newcomb, for Abel Roper, John Martin, and Henry Herringman . 3 . 1676 .
• Web site: Weldon. Ralph. Chronological Notes Containing the Rise, Growth and Present State of the English Congregation of the Order of St. Benedict. Benedictine Nuns at Dunkirk. November 11, 2015. November 11, 2015. https://web.archive.org/web/20151117021711/http://www.forgottenbooks.com/readbook_text/Chronological_Notes_Containing_the_Rise_Growth_and_Present_State_of_1000576405/335. 2015-11-17. dead.