Darcy was descended from Sir Roger Darcy of Old Cotes, whose son Sir John had represented Nottinghamshire in 1320. His father’s estate, estimated on his death at £4,000 p.a. lay principally in south Yorkshire, but the family home at Aston was sufficiently close to the border with Nottinghamshire for Darcy to be described as a ‘neighbour’ of East Retford in an account of the 1624 by-election.
Described by the letter-writer John Chamberlain as ‘a very proper and hopeful young gentleman’,
