John Mynors came of a distinguished Staffordshire family, being in all probability descended from the John Mynors who served as steward of the duchy of Lancaster lordship of Tutbury during the early 14th century. There seems little doubt that he was a kinsman, perhaps even the grandson, of Thomas Mynors, lord of Blakenhall, a local commissioner of some note, and that his other relatives included John Mynors (fl. 1392) of Uttoxeter, from whom he may have inherited certain property in the town.
During their early years, Mynors and his two brothers, Thomas and William, were chief among the supporters of Hugh Erdeswyk in his various feuds with Staffordshire landowners and duchy of Lancaster officials. Even allowing for the highly coloured language of contemporary legal records, their reputation as ‘notorii latrones et depredatores, insidiatores viarum et depopulatores agrorum’ seems to have been well deserved. So many and frequent were the ‘trespasses, misprisions and felonies’ in which they played a leading part, that the Commons in the Parliament of 1410 presented a petition condemning their activities and listing no less than ten violent incidents in which they had been involved. Between October 1408 and April 1409, the three brothers and their armed followers had attacked a number of tenants and employees of the duchy, among whom were Sir Nicholas Montgomery I, Sir John Blount (constable of the duchy castle at Newcastle-under-Lyme) and the two receivers of Needwood chase, against whom they clearly harboured a political as well as a personal grudge, having been excluded from the benefits of royal patronage. John Mynors alone was accused of murdering a royal tax collector and of assaulting one of Montgomery’s tenants. He and his brother William were, moreover, said to have joined with Erdeswyk in offering armed resistance to the royal commissioners sent to arrest them in November 1408 and February 1409, and, indeed, although Thomas Griffith offered sureties of 500 marks on their behalf, there is no evidence to suggest that they ever appeared before the King’s Council to answer for their misdemeanours. As a result of the Commons’ appeal, proceedings were finally begun against them in the court of King’s bench during the Trinity term of 1410, yet they ignored repeated writs of summons to present themselves before the justices and were twice able to evade arrest by commissions set up in the following year.
Although he was never again responsible for outbreaks of disorder on the scale of those caused by him in his youth, Mynors occasionally came to blows with his neighbours. The most notable of these disputes took place over the ownership of the manor of Fisherwick in Staffordshire, which he reportedly seized by force in the summer of 1419 from the feoffees of Elizabeth, Lady Clinton. The latter began a lawsuit against him in Chancery, while suing him at common law for trespass: within a matter of months relations between the two parties had deteriorated so badly that the manor was taken into royal custody until a settlement could be reached. Mynors appears to have lost his case, for in May 1421 he conveyed the manor back to the feoffees, whose title he did not subsequently question.
A man of Mynors’s influence would probably have been made a shire knight on his own account, although it is possible that his return to Parliament as Member for Newcastle-under-Lyme in 1419 and 1422 owed something to his new connexion with the duchy of Lancaster, whose officials exercised considerable influence over the choice of borough representatives. Even so, he did not entirely escape the consequences of his past transgressions, for he never assumed a major role in local government (being only twice made a royal commissioner), and understandably failed to qualify for the post of sheriff or escheator. Yet, in November 1419 he acted as a mainpernor in Chancery for Eleanor, the widow of Sir Nicholas Dagworth and wife of the traitor, John Mortimer; and in the following year he performed a similar service at the Exchequer. He attended the Staffordshire county elections for both of the Parliaments held in 1421, and was again present in 1423, 1425, 1442 and possibly 1449 to witness the returns; he also took part in the Derbyshire elections to the Parliament of May 1421, but does not appear to have voted there after this date.
