A merchant and ‘yeoman’,
Immediately after gaining the freedom, for which he paid an entry fine of 20s., Syslyngham was embroiled in a lawsuit at Westminster. The plaintiff was a burgess of Colchester named John Blackhall. In pleadings of Hilary term 1443, he alleged that Syslyngham and Thomas Sent, another Colchester man, had taken £40 from his chest in that town just under a year earlier. In response, Syslyngham claimed that no more than £14 3s. 8d. had come into his hands and that Blackhall had freely given this sum to him. He added that he had received it on behalf of his co-defendant, in part payment of a debt that Blackhall owed Sent.
Still active in the later 1470s, Syslyngham completed his last term as bailiff in January 1478, after which he disappears from view. A year earlier, his son-in-law, Ralph Sellis, had gained admission to the freedom of Maldon. Although an outsider to the town, Sellis was exempted by local custom from paying any entry fine by virtue of his marriage to a burgess’s daughter.
