 William Heytesbury was most likely born before 1313 in Wiltshire (Salisbury Diocese). He is first mentioned as a fellow at Merton College in Oxford in 1330; he is thus among the second generation of Oxford Calculators (a follower of Thomas Bradwardine and Richard Kilvington, a contemporary of John Dumbleton and Roger Swyneshed, and a predecessor of Richard Swineshead). He held the administrative position of a bursar of Merton in 1338–1339, responsible for determining dues, auditing accounts, and collecting  revenues.[1]  By 1340 he had completed his regency in arts at Merton and, together with John Dumbleton, was named a foundation fellow at the new Queen’s College in 1340, but was soon mentioned among the fellows of Merton College again. He is recorded as having become a Doctor of Theology in 1348, yet none of his theological works are known. He was chancellor of the University in 1371–72 (and perhaps also in 1353–54) and died shortly thereafter, between December 1372 and January  1373.[2]