Sir Francis Radclyffe came from a long-established Catholic gentry family in Northumberland with extensive property there and in surrounding counties. His estate included Dilston, Amble, Meldon, Temple Thornton in Northumberland, other lands in Westmorland and Yorkshire and, most lucratively, lead mining interests in Alston Moor in Cumberland. By 1673 it brought in an annual income of £6,263.
From at least 1672 he was keen on matching one of his children with a member of the royal family and claiming for himself a title, preferably the earldom of Sussex, which had previously been in the possession of another branch of the Radclyffes.
That plan fell through, but in August Sir Francis’s eldest son Edward Radclyffe, later 2nd earl of Derwentwater married Mary Tudor, the illegitimate daughter of Charles II by the singer and actress Mary Davies. Her portion was reported to be of £15,000, and Sir Francis settled £3,000 on the couple and £2,500 a year for their maintenance.
Derwentwater refused to take the oaths to the new monarchs, and as a Catholic he was excluded from taking his seat in the House in William III’s Parliaments. After the Revolution he was seen as the leading Jacobite in the north. His residence at Dilston Hall was constantly watched, and at one point he was under threat of imprisonment.
