Like his father, after whom he was named, Onewyn represented Rye in four Parliaments, as well as serving as mayor for a number of terms. The father died at some point between August 1427 and February 1428, by which date land of his was said to belong to his heirs.
Onewyn took a prominent part in the government of Rye and in the deliberations of the Cinque Ports generally. On as many as 25 occasions between 1446 and 1458 he was sent as a delegate from his home town to meetings of the Brodhull at New Romney.
Yet Onewyn and his fellow rulers of Rye were not always in accord. Towards the end of 1449 he had a violent altercation with another jurat, John Southyn, in the presence of the mayor and their colleagues, in which he went so far as to lay his hand on a weapon. In the following spring he rode again to London to have the charter regarding the liberties of Tenterden confirmed and registered in the Exchequer, and in that troubled summer of 1450 he attended a general Brodhull and temporarily took over the duties of the King’s bailiff of Rye.
It was at this point, in August 1451, that Onewyn was elected mayor of Rye, and he then held the post for three consecutive years. During his second term (1452-3) he made several journeys on behalf of the community, going to London, East Grinstead and, along with Babylon Grantford*, to Canterbury, this last being to witness the installation of Archbishop Kemp at the cathedral.
As had happened earlier, however, Onewyn’s violent temperament led to serious conflicts at home in this same period. First of all, he was required to find sureties in £100 that he would keep the peace to John Swan, one of his fellow jurats, and he was fined 2s. for two separate assaults on Swan, in which he drew his dagger. On 14 Mar. 1456, two days after Parliament was dissolved, he was bound over in £30 in the mayor’s court to keep the peace to his old adversary John Sutton and two of the latter’s kinsmen, although he had the support of other of the jurats who provided pledges for his good behaviour. Subsequently, he was fined again, for threatening Sutton’s putative son John†. There was yet more trouble when Onewyn was sent to the Yarmouth fair that autumn, although this time he was not directly to blame. William Stamer of Hastings, the master of a vessel used for coastal fishing, seized a ‘coggeship’ containing goods worth 2,000 marks belonging to merchants of Norwich and Bishop’s Lynn, claiming that they had failed to pay customs dues. In retaliation, Edmund Wydewell* and his fellow bailiff of the town of Great Yarmouth arrested the four bailiffs from the Ports (Onewyn, John Goldyng†, Robert Scras* and Richard Smallwood*). A special Brodhull, meeting on 14 Dec., ordered that Stamer and his crew be attached by the bailiff of Hastings and if it were found that they took the goods wrongfully they were to abide by the judgement of the Brodhull; but at the same time the barons started proceedings in Chancery regarding the wrongful imprisonment of their representatives, contrary to their liberties and franchises. The matter was still a bone of contention as late as May 1458, although another special Brodhull then decided that a letter should be sent to the merchants of Norwich and Lynn inviting them to come to Hastings to sue Stamer, now a prisoner, and recover such of their goods as could now be found in the liberty, provided that they ceased all legal processes against Onewyn. How long the latter had been held at Yarmouth is not clear, but he was certainly present at this Brodhull to make his case,
Nevertheless, his troubles were by no means over. On 23 Mar. 1459 the warden, the duke of Buckingham, sent orders to the mayor and bailiff of Rye to bring him to Dover on 8 Apr. to answer what should be laid against him by the Crown, on pain of £200.
