In 1657 his wife arranged a marriage between their second daughter Sarah and Robert Robartes son of John Robartes, 1st Earl of Radnor, a wealthy Cornish Presbyterian and former Parliamentarian field-marshal.
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While talking to a friend in a bookseller's shop at Tunbridge, Wycherley heard The Plain Dealer asked for by a lady who, in the person of the countess of Drogheda (Letitia Isabella Robartes, eldest daughter of the 1st Earl of Radnor and widow of the 2nd Earl of Drogheda), answered all the requirements.
John Robartes, 1st Earl of Radnor and Viscount Bodmin PC (1606 – 17 July 1685), known as The Lord Robartes (or John, Lord Roberts) between 1634 and 1679, was an English politician, who fought for the Parliamentary cause during the English Civil War.