John was the son of a lawyer from a prominent Cambridge family who had sat for the shire earlier in the century. By 1412, Nicholas Morys had acquired lands in Northamptonshire, so his son was to become a landowner in two counties.
It was as John Morys of Cambridge, esquire, that Morys was bound in a recognizance for £50 to John Burgoyne* of Dry Drayton in 1432, but as of Trumpington that he took the general oath not to maintain peace-breakers two years later.
By the mid 1430s, Morys must have enjoyed a reasonable landed income, since his estates were valued at £35 p.a. for tax purposes in 1436 and at £36 p.a. in 1451. Assuming that the subsidy commissions in question used the same criteria for both these assessments, he cannot have been active in the land market between the two dates.
Morys was not involved in county administration until the 1440s. He first attended a shire election in December 1441 (to the Parliament of 1442), and the Crown appointed him to his first and only peace commission just over four years later. As a j.p. he attended the quarter sessions for a modest total of ten days, but at this stage of his career he was devoting some of his time to private affairs in Northamptonshire. In April 1446 he quitclaimed a manor at Hannington in that county to William Tresham* and his feoffees, and he was one of those to whom John Styuecle, a London brewer with Cambridge connexions, made a quitclaim of lands elsewhere in Northamptonshire two months later.
Later that year, if not while a sitting MP, Morys became involved in the foundation of what was to become Queens’ College, Cambridge.
For whatever reason, Morys’s days as an office-holder in Cambridgeshire were over by 1449, although he continued to take a limited part in its affairs after this date. He still attended parliamentary elections and he was a member of a grand jury that, in October 1452, indicted those in Cambridgeshire said to have plotted the death of the King.
