Of obscure background, Clay achieved advancement as a soldier and a servant of the house of York. His military career gave him the means to invest in land and probably influenced his choice of wife, since his brother-in-law Sir John Astley, a renowned duellist, was likewise a soldier who became a committed Yorkist.
In 1421, Clay was no more than a lowly man-at-arms based at Rouen. By the end of the decade, however, he possessed a retinue of his own and was captain of the fortress of St. Katherine’s just outside the city.
By now, Clay was increasingly associated with York, the King’s lieutenant-general and governor of France and Normandy, and by the latter half of 1443 he had become treasurer of the duke’s household in France. Probably the ‘Jean Secalay’ who with York and others received Henry VI’s bride, Margaret of Anjou, on her entrance into Rouen in March 1445,
There is no evidence of Clay’s activities between March 1456, when the Parliament was dissolved, and September 1460, save that in October 1459 he was with York’s army at Ludford Bridge. As a result, he was one of those attainted for treason in the Parliament of 1459.
In the following July Clay was placed on the commission of peace for Hertfordshire and in August he was appointed to an embassy to the duke of Burgundy. In the letters of appointment he was described as the ‘great steward of the household of the late duke of York’, presumably a position which he exercised under the widowed duchess, whom he also served as her chamberlain. He and his fellow ambassadors, John Wenlock*, Lord Wenlock, and Peter Taster, dean of St. Saviour’s, Bordeaux, were given several objectives. First, they were to negotiate a truce and commercial treaty with Burgundy; secondly, they were to try with the duke’s help to obtain a truce with France; finally and secretly, they were to propose a match between Edward IV and the duke’s niece, the Mademoiselle de Bourbon. The ambassadors, who crossed to Calais within a month of their appointment, met the duke of Burgundy at Valenciennes. In the end, their only real achievement was to confirm and strengthen the existing friendship between the Yorkists and Burgundy, for the marriage proposals came to nothing and, despite the duke’s help, attempts to seek a truce with France proved abortive. At Valenciennes the bishop of Arras entreated the English ambassadors and the duke to support a crusade called by Pope Pius II, but Clay and his associates refused to make any promises regarding a matter which was beyond their authority to discuss. The duke lavishly entertained the ambassadors throughout their stay. Before they left, he held a banquet in their honour at which Clay (wearing the Yorkist collar of suns and roses) and Wenlock sat on either side of him, and he sent them gifts of silver plate as they were preparing to depart. They returned to England via Calais, arriving back in London on 21 Nov. In spite of the limited success of their mission, Clay and Taster each received £82 in wages (£1 for every day they were away) and Wenlock twice that amount, and they were also allowed an additional £20 for their travelling expenses.
Shortly after his return, Clay gained a further reward for his good service to the King and the late duke of York. By letters patent of December 1461, the Crown assigned him estates worth 200 marks in Essex and Cambridgeshire, and granted to him, his wife and their son the reversion of the chief manor of Cheshunt after the death of Elizabeth, Lady Say. The Essex and Cambridgeshire lands had belonged to the attainted Lancastrian, Thomas Ormond, whose manor at Swavesey in Cambidgeshire he was also to acquire,
In March 1462 the Milanese envoy Antonio della Torre reported that Clay was about to take part on another embassy, this time to the papacy. Della Torre must have been misinformed since in the spring and summer of that year the MP, who is not known to have gone overseas again after his return from Valenciennes, was engaged with his duties as a knight of the King’s chamber.
In his will, made on 8 Sept. 1464 and proved ten days later, Clay asked to be buried beside his daughter Joan, who had died in October 1453 and lay in the chancel of Cheshunt parish church. He provided generously for his wife, another Joan, whom he appointed his principal executor, by granting her control of his goods and chattels and awarding her a life interest in most of his lands at Cheshunt. Apart from the holdings at Cheshunt, his real estate consisted of the properties confiscated from Thomas Ormond, his annual fee of £20 from Bassingbourn and the reversion of the manor of Cheshunt after the death of the long-lived Lady Say. Clay directed that his son and namesake, a young man not far short of his majority, should take possession of either the manor of Swavesey or the annuity from Bassingbourn and all his lands in Essex when he came of age. He provided for his surviving daughter, Cecily, and her husband Robert Green† by settling upon them lands worth 20 marks p.a. and three inns at Waltham Cross in Cheshunt, and by bequeathing Green, a fellow Household man, six silver ‘bolle peces’ from his collection of plate. Clay’s widow was assisted by three co-executors, Green, Hugh atte Fenne* of the Exchequer and William Scott. Following the attainders of 1459, the Lancastrian government had made Fenne one of the receivers of Clay’s lands but this appointment had evidently not caused any animus between him and the MP. The last-named executor’s identity is unclear but he may have been William Scott of Essex rather than one of the more prominent Scotts of Smeeth, Kent.
In the end, neither Scott nor Fenne took up their duties as Clay’s executors and it fell to his widow, assisted by his son and Robert Green, to fulfil his will.
