By the early fifteenth century, the Grimsby family had resided at Kingston-upon-Hull for several generations and established a tradition of parliamentary service. Peter Grimsby† (d.1379), probably John’s grandfather, was mayor of Hull in 1361-2 and represented the town in the Commons of 1362, 1368 and 1371; Simon Grimsby, John’s father, served several terms as mayor and was a Member of four Parliaments of Richard II’s reign; and Walter Grimsby, possibly John’s brother, sat for Hull in the Parliaments of November 1414 and March 1416.
Like Simon Grimsby, John pursued a mercantile career, and he was among the Hull merchants who were active in Rouen late in Henry V’s reign.
Not long after relinquishing the position of controller, Grimsby took up office as one of the bailiffs of Hull. His term as such may, however, have been interrupted by other duties, since in November 1430 the Crown appointed the jurist, Master William Sprever and ‘John Grymesby, esquire’ as its ambassadors to Denmark. Assuming that the latter was the subject of this biography rather than a namesake, it is unclear to what he owed the style of ‘esquire’, notwithstanding his family’s local wealth and status. Even if the ambassador, it is unlikely that Grimsby actually went abroad with Sprever, who departed the realm in February 1431 and did not come home until the following December, since the account that the latter presented to the Exchequer failed to mention his fellow envoy.
In June 1433 Grimsby was returned to the Parliament of that year, and at the beginning of this assembly the burgesses of Hull successfully petitioned for the confirmation of the charters Edward I, Edward III, Richard II and Henry IV had granted their town, and obtained letters patent confirming all legacies of land made there since Edward I’s reign.
Grimsby died within months of the dissolution of the Parliament of 1437. He left no will and in July that year administration of his estate was granted to two merchants of Hull, William Burgh and Thomas Duby, and a couple of chaplains, William Ripplyngham and Richard Flynton.
