The son of Thomas Stanley, 2nd Earl of Derby, did not take the style 'King', and he and his successors were generally known instead as 'Lord of Mann'.
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Edward Stanley, born 1962, became 19th Earl of Derby in 1994.
It came into the estates of the Earls of Derby through the marriage of Elizabeth Stanley (the daughter of Sir Thomas Stanley & Joan Gousell) & Thomas Strange in the early 15th century.