Lady Mary Tudor (16 October 1673 – 5 November 1726), by marriage Countess of Derwentwater,[1] was an actress and biological daughter of King Charles II of England by his mistress, Mary "Moll" Davies, an actress and singer.

[2] Mary grew up in a house on the south-west side of St James Square, close to St James's Park and Whitehall palace,[3] and from an early age she was surrounded by the high society of The Restoration.

[6] In September 1683, she was issued an annuity of £1500 (roughly equivalent to £284,456 in 2023), and five months later, on 21 February, her precedence was heightened to that of a daughter of a Duke.

[7] On 18 August 1687, Lady Mary married Edward Radclyffe, 2nd Earl of Derwentwater (9 December 1655 – 29 April 1705) by whom she had four children:[8] Mary formally separated from Lord Derwentwater on 6 February 1700, it could be due to her unwillingness to convert to Roman Catholicism or because she was unfaithful.

A few months later, on 26 August, Lady Mary married Major James Rooke.