Nothing is known for certain of John Dunstaple's background or early life. This uncertainty, and the general vagueness surrounding most details of his life, has led to much speculation and sometimes fictionalized information concerning his life and career. Some of the spurious information comes from misreadings of
Johannes Tinctoris's writings, leading to the erroneous identification of the composer with the 10th-century saint
Dunstan. Dunstaple's birthdate is a conjecture based on his earliest surviving works from around 1410–1420, which suggests he was born in the late 14th century; the musicologist
Margaret Bent records . His birthplace is unknown, though it is assumed that his family adopted their surname after the town of
Dunstable, Bedfordshire. Modern scholarship has sometimes used the spelling 'Dunstable' to match the town's name, though sources of the composer's time generally refer to him as 'Dunstaple' instead. The musicologist
Margaret Bent notes that the 'p' spelling is more than twice as common as the 'b' variant in musical sources, and while the few extant English sources use the 'b' and 'p' variants with equal frequency, contemporary non-musical sources almost exclusively follow the 'p' spelling. Less common spellings include 'Dunstapell', 'Dumstable' and 'Donstaple', among others; one source simply inscribed 'J. D.'. Records from the early 15th century include many references to people named (or with a similar name to) 'John Dunstaple', making it difficult to identify the composer. The more plausible candidates include a canon of
Hereford Cathedral (1419–1440) named 'John Dunstavylle', though there is no convincing evidence for this. However, the composer is usually identified as the 'John Dunstaple' that owned a series of astronomy treatises and was described as a 'musician with the Duke of Bedford'. He is widely held to have been in the royal service of
John of Lancaster, 1st Duke of Bedford, the fourth son of
Henry IV and brother of
Henry V. As such he may have stayed in France for some time, since the duke was
Regent of France from 1423 to 1429, and then Governor of
Normandy from 1429 to his death in 1435. He owned property in Normandy, and also in
Cambridgeshire, Essex and London, according to tax records of 1436. After the death in 1437 of another patron, the
Dowager Queen Joan, he evidently was in the service of
Humphrey, Duke of Gloucester, the fifth son of Henry IV. Unlike many composers of the time, he was probably not a cleric or monk, though there are links with
St Albans Abbey (see below); he was probably married, based on the record of women sharing his name in his parish, and he also owned a manor in
Hertfordshire. Dunstaple's connections with St Albans Abbey are at least twofold: • the abbot
John Whethamstede is associated with the Duke of Gloucester (who was buried at St Albans following his death in 1447), and Dunstaple's isorhythmic
motet Albanus roseo rutilat, possibly with some of the Latin words adapted by Whethamstede from an older poem, was clearly written for St Albans, possibly for a visit to the abbey by the Duke of Bedford in 1426. • Whethamstede's plan for a magnificent library for the abbey in 1452–53 included a set of twelve
stained glass windows devoted to the various branches of learning. Dunstaple is clearly, if indirectly, referred to in some of the verses the abbot composed for each window, not only music but also
astronomy,
medicine, and
astrology. Epitaphs written upon Dunstaple's death identify him as not only a musician, but as well as respected mathematician, astronomer and
astrologer. Dunstaple is referenced in at least three non-musical manuscripts. Of these, Bent considers
GB-Ce 70 (
Emmanuel College, Cambridge) the most important and it includes astrological works with accompanying drawings which may be his own. Another,
GB-Ob Laud misc. 674 (
Bodleian Library, Oxford), demonstrates "high competence but no more originality than any of his contemporaries" according to Bent. Although no extant mathematic or scientific manuscripts written by him survive, he is known to have made copies of other's manuscripts. Dunstaple also owned two manuscripts by
Boethius: a copy of
De musica and
De arithmetica. Dunstaple died on
Christmas Eve 1453, as recorded in his epitaph in London's church of
St Stephen Walbrook, where he was buried. ==Music==