Gibthorpe hailed from a long-established family of duchy of Lancaster tenants in south Lincolnshire, but his place in their poorly-documented pedigree is not clear. The most likely speculation is that he was the younger brother of Simon Gibthorpe of Thorpe St. Peter, who attested the Lincolnshire elections of 1429 and 1433, and the son of Sir William Gibthorpe, who seems to have owed his knighthood late in his short career to service in Henry V’s campaigns.
Gibthorpe clearly had to make his own way in the world, and he was to do so in the service of his clerical neighbour, William Waynflete, who became bishop of Winchester in 1447. This service explains his entry soon afterwards into the royal household – at Pentecost 1448 he first received robes as a yeoman of the chamber – and his election to represent Taunton, a borough in the bishop’s patronage, in the Parliament of February 1449. He continued to receive livery in the King’s chamber,
According to a petition presented to Chancellor Kemp by his fellow Household servant, William Warbleton*, Gibthorpe secured the grant of the parkership of Odiham by fraud. Two months before it was made, Warbleton had been granted the constableship of Odiham castle with the attendant parkership for life as compensation for the surrender of certain of his lands to the royal foundation at Eton. He had then, or so he claimed, delivered the letters patent of grant to our MP, trusting him to sue, in his name, the relevant writs of liberate and allocate out of Chancery and then return the letters patent to him on our MP’s next coming to his manor of Sherfield in Hampshire. But Gibthorpe ‘of gret subtilite and vntrouthe’ had informed the King and chancellor that the grantee wanted him to have the parkership and secured letters patent to that effect.
Towards the end of Gibthorpe’s life his service to the Crown shifted from the Household to his native county. On 7 Nov. 1457, while his master Waynflete was chancellor, he was named as escheator of Lincolnshire, and, while in office, he was nominated to his first and only ad hoc commission of local government. If he played any part in the civil war of 1459-61, it has escaped notice in the surviving records, but it is possible that he met his death on the Lancastrian side in one of the battles of these years. He was, in any event, dead by 6 Feb. 1462 when his neighbour and another of Waynflete’s servants, Hugh Tilney of Boston (younger brother of Robert Tilney*), sued out a pardon as his executor. Six days later his putative elder brother, Simon, did the same. A Chancery petition of about the same date names the other executors as Alice Gibthorpe, who was probably his widow (although it is possible she was his mother).
