John came from a branch of the Dengaine family, long established at Taversham and Stowe-cum-Quy in Cambridgeshire, which also possessed the manor of Waresley in Huntingdonshire. In August 1363, on the death of his father, who had represented his native county in no fewer than 12 Parliaments between 1338 and 1362, he inherited certain properties in Great Wilbraham (near Teversham) which were held of the Crown by the unusual service of mewing a sparrow-hawk.
By the 1380s Dengaine was a respected member of the community, but that had not always been the case. Just before his father’s death he had been in serious trouble: in June 1363 a commission of oyer and terminer was set up to investigate a complaint made by none other than the chancellor, Simon Langham, then bishop of Ely, that while he had been at Cambridge engaged upon ‘the affairs of the King and realm’, Dengaine and others had stolen certain of his goods and assaulted his servant. Then, in 1366, Dengaine was proclaimed an outlaw in Hertfordshire following his failure to appear in court to answer John Henxteworth† for a debt of £40; he claimed to be ignorant of the suit and provided securities for his future attendance to contest the charge. Dengaine took out royal letters of attorney in preparation for a journey to Gascony in the following year, but nothing more is known of any military activities overseas. However, it is possible that he served at some later date under John of Gaunt, for in 1373 he witnessed a transaction whereby the duke was enfeoffed of the Cambridgeshire manor of Landbeach. There are hints throughout Dengaine’s career of an inability to manage financial affairs: in December 1377, for example, he entered into recognizances for £84 as guarantee that he would pay off arrears due on his account at the Exchequer for his term as sheriff. There were continuing difficulties with the lawcourts, and he is known to have acquired three royal pardons in the early years of Richard II’s reign — in June 1377, March 1381 (specifically for the escapes of felons in his custody as sheriff) and May 1382. Sir John was elected to both Parliaments of 1388, when the Lords Appellant were in control of the government, but, save for his association with Thomas Arundel (now made archbishop of York) as a co-feoffee of the Burgh estates, he is not known to have been personally connected with those in power. Curiously enough, it was in May 1388, during the second session of the Merciless Parliament, that he entered into recognizances in £10 to John Lincoln, one of the King’s clerks then in prison by the Appellants’ command.
In his will, made on 23 Apr. 1392, Dengaine left instructions for the future sale of two manors after the death of his widow Joan, to provide religious services for the souls of himself and his wives. He died at some unknown date after June 1394, but before 1395, when his widow obtained an episcopal licence for a private oratory at Shepreth. Subsequently, the estates of Dengaine’s first wife were divided between her daughters, Joan St. George and Mary Blyton. By his second wife Sir John appears to have had a son named William, who before July 1410 acquired his father’s property in Long Stanton.
