Although he lived at Barton-on-Humber, some miles to the north-west of Grimsby, this MP was almost certainly related to William Duffield (d.1422), a master mariner who was mayor of the town on no less than four occasions between 1394 and 1410. Another William Duffield sat with Richard in the Parliament of 1425, and may well have been his brother.
There can be little doubt that Duffield was a lawyer, for besides serving as clerk of the peace in Lindsey for some 38 years, he was much in demand as an attorney and mainpernor. Between November 1406 and 1433, for example, he performed the latter service for at least 13 people, among whom were the influential Lincolnshire landowners (Sir) Thomas Cumberworth, John Hatfield and Walter Tailboys†.
In contrast with his well-documented professional career, comparatively little is known about Duffield’s personal affairs. Throughout his life his home remained at Barton-on-Humber, where he enjoyed a close friendship with a neighbour named John Barnetby, for whom he witnessed deeds (in 1407) and acted as a trustee (in 1409). Despite his connexion with the abbot of Bardney he sided with his fellow parishioners during a dispute between them and the abbot over altar charges and other financial matters. The quarrel came to a head in March 1421, when he and others undertook to accept a compromise solution reached by arbitration. Although not particularly litigious on his own account, Duffield did once go to law for the recovery of a debt of 40s. which was owed to him by a clergyman. On the whole, however, his life passed without vicissitudes of this kind, and by 1431, if not before, he was able to enjoy uninterrupted the ownership of an estate worth at least £10 p.a.
