Although Cheyne’s background, wealth and family connexions all predicted for him a prominent role in regional and possibly even national affairs, his premature death at the age of 28 confounded these expectations. He belonged to the third generation of his family to sit in Parliament, for his grandfather Sir Ralph Cheyne† (d.1400) had represented Wiltshire three times, and his father had sat once for Dorset. The combined estates of his parents in seven counties provided them with an income of at least £193 p.a., of which some £51 came from Wiltshire, the county which Edmund himself was to represent in the Commons. His father Sir William, twice sheriff of this county and once of Devon, became a military captain of note, who in 1417 led a force of 75 men for the defence of Harfleur,
Two months earlier, in December 1422, the death of Cheyne’s kinswoman Katherine Stretch, the elderly widow of both his great-uncle Sir Edmund Cheyne† (d.1376) and his maternal grandfather Sir John Stretch (d.1390), had released more lands of his inheritance, which were let out to farm by the Crown in May 1423. These estates included manors in Cambridgeshire and Devon, as well as that of Poyntington in Somerset.
It is quite likely that Cheyne saw military service overseas before he came of age, although the documentary evidence for this is lacking. He certainly did so later in the decade: on 2 Mar. 1425 he contracted to serve for six months in France with the Regent, the duke of Bedford (from whom he held one of his manors in Cambridgeshire); he obtained letters of protection on 16 May, and was mustered with the 13 men-at-arms and 42 mounted archers under his command before crossing from Dover to Calais a few days later.
Also while the Parliament was in progress, Cheyne was knighted, most likely on the eve of the coronation of Henry VI, which took place on 5 Nov. His elevation may be charted from the way he was described (first as esquire then as knight) when he witnessed a series of deeds dated that month and in December on behalf of the treasurer Hungerford.
In the following year Alice married the Lincolnshire landowner Walter Tailboys*, who undertook to settle on her a handsome jointure.
