Who married Charlotte Maria Radclyffe, 3rd Countess of Newburgh?

James Radclyffe, 3rd Earl of Derwentwater (26 June 1689 – 24 February 1716) was an English peer who participated in the Jacobite rising of 1715 and was executed for treason.

Charles Radclyffe (3 September 1693 – 8 December 1746), titular 5th Earl of Derwentwater, was one of the few English participants in the Risings of 1715 and 1745.

The Radclyffes were Catholics from Northumberland, with long-standing links to the exiled Stuarts; sentenced to death in 1716, he escaped and spent the next 30 years in Europe. He was captured at sea along with his eldest son in November 1745 en route to Scotland and executed on 8 December 1746, under the warrant issued in 1716. His son James was released and later settled in Slindon, West Sussex.