The obscurity of this MP’s career is particularly surprising in view of the wide range of influential relationships which could have been used by him to further his own interests. None of the other Bedfordshire Members returned during our period could boast such a galaxy of influential kinsmen, yet few showed the same reluctance to play any part whatsoever in local or national affairs. For much of his life Cockayne was overshadowed by his father, who, as one of the most eminent lawyers of his day, rose to prominence in the service of the house of Lancaster. Like his own father before him, John Cockayne held office as chief steward of the duchy of Lancaster north of Trent, being appointed by John of Gaunt, who also chose him to execute his will. His other posts then included the recordership of London, which he held from 1395 to 1399, but it was not until Gaunt’s son, Henry of Bolingbroke, seized the throne that his talents were fully recognized. He was replaced as steward in February 1401, having by then been made chief baron of the Exchequer; and in 1406 the King saw fit to offer him a second important judicial appointment as one of the justices of the court of common pleas. Perhaps because of the demands thus made upon him, he resigned as chief baron in 1413, but he continued to sit as a judge until his death 16 years later. Some idea of the prestige which he enjoyed, even as a comparatively young man, may be gained from the fact that Reynold, 2nd Lord Grey of Ruthin, was prepared to accept him as a son-in-law, and in this way the Cockaynes became linked by marriage to the most important landowning family in Bedfordshire. Although he himself came from Ashbourne in Derbyshire, the judge evidently wished to consolidate this potentially useful territorial connexion, and in 1417 he and his wife bought the Bedfordshire manor of Bury Hatley from Sir Edward Botiller for 1,000 marks.
So far as the electors of Bedfordshire were concerned, Cockayne’s pedigree seems to have compensated for his total lack of administrative experience; and this fact alone would account for their readiness to choose him as a shire knight. He had, indeed, already attended the county election to the Parliament of 1420, and was to do so again later, in 1425, 1426 and 1427.
