"Charles FitzCharles, 1st Earl of Plymouth (1657 – 17 October 1680) was the illegitimate son of King Charles II of England, by Catherine Pegge. He had ...
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a sister called Catherine FitzCharles who is believed to have become a nun. His mother went on to marry Sir Edward Greene of Samford in Essex, and had one child, Justinia Greene. His subsidiary titles were Viscount Totness and Baron Dartmouth.
He died while serving as part of the Tangier Garrison." - (en.wikipedia.org 12.08.2021)