In about 1405 Mallory inherited from his father (the sheriff of Warwickshire and Leicestershire 1391-2, and of Northamptonshire 1392-3), the manor of Winwick, which had belonged to the family since the 13th century, together with that of Stormsworth (Leicestershire), and from his mother Newbold Revel (then known as ‘Fenny Newbold’) and lands in Easenhall, Stretton, Aston and Pailton, all in Warwickshire.
It may have been this John Mallory ‘esquire’ who was a prisoner in the Tower in February 1400, at the same time as the surviving conspirators of the plot to dethrone Henry IV, but if so he evidently escaped severe penalty. Mallory’s marriage led to his involvement in the affairs of the Chetwynd family, prominent members of the minor gentry of the region: thus in 1412 he was party to transactions with kinsmen of his wife and the Hertfordshire landowner Sir John Poultney; and in 1423 he assisted his brother-in-law, John Chetwynd, in a lawsuit over land at Alspath. Having been first returned to Parliament in 1413, he was appointed sheriff of Warwickshire three years later. It is not known when he first came to the attention of Richard, earl of Warwick, but at Easter 1417 he witnessed the deed by which the manor of Baginton was settled on the earl in reversion. Furthermore, there were family connexions which might have encouraged his entrance into the Warwick circle: his kinsman, Sir Giles Mallory, had once served as chief steward of the Beauchamp estates, and his own son, Thomas, had joined the earl’s retinue for the French campaign of 1415. In 1419, the year of his second return to Parliament, Mallory was associated in business transactions with others of that affinity such as Sir Thomas Burdet, Sir Alfred Trussell and John Harewell. His name appeared on the list of 13 sent by the j.p.s. of Warwickshire to the King’s Council in January 1420 in response to a request for information about those best able to do military service, but there is no evidence that he ever took part in the conquest of France.
Mallory is last recorded on his re-appointment as a j.p. in October 1435. He was excluded from the bench in February following and died before June, when his widow negotiated with Sir Edward Doddingsells the marriage of her daughter to Doddingsells’s son.
