Thomas was the son of a namesake who served the archbishop of Canterbury as bailiff of the liberty of South Malling in Sussex in the mid 1420s, and was described as a ‘franklin’ in 1431, when sued in the court of common pleas by John Parker I* of Hastings.
It is a measure of Gynnour’s standing in Sussex, or else of his position on the sheriff’s staff, that on 9 Oct. 1449 he attested the shire election held at Chichester.
That same autumn Gynnour was once again chosen as an MP, this time for the borough of New Shoreham, which was somewhat closer to his home. On this occasion the sheriff making the return was John Penycoke*, one of the esquires for the King’s body, and he too made use of Gynnour’s services. In February 1453 Penycoke was to authorize our MP to receive custody on his behalf of John Lye†, a royal ward, and in the following Michaelmas term he brought a plea in King’s bench against one William Edward for assaulting and wounding his ‘servant’ Gynnour in the London parish of St. Mary Le Strand so that the injured man was unable to do his business, collecting debts, for more than four months.
Gynnour must have often been resident close to the royal courts at Westminster, and in January 1457 he had been the recipient of a gift of goods and chattels made by a London goldsmith. This was in association with John Faukes, the master in Chancery and clerk of the Parliaments, but there is no evidence of a close relationship between them.
Yet all was not well for Gynnour, as a spate of lawsuits in the early years of Edward IV’s reign makes clear.
Emerging from these set-backs, in the mid 1460s Gynnour was engaged by the Sussex landowner Nicholas Morley*of Glynde to conduct his business in Hertfordshire and with the dean and canons of St. George’s chapel, Windsor,
