Thomas Ashwell or Ashewell (c. 1478 – after 1513 (possibly 1527?)) was an English composer of the Renaissance. He was a skilled composer of polyphony, and may have been the teacher of John Taverner. His admission to St. George's Chapel as a chorister in 1491 suggests a birthdate of approximately 1478, but nothing else is known about his early life. He stayed at St. George's until 1493, and account records at Tattershall College in Lincolnshire list him as a singer there in 1502 and 1503. He was in a position of authority at Lincoln Cathedral in 1508, according to records there, and was employed at Durham Cathedral as Cantor or Master of the singing boys, and to provide music for the Lady Chapel, in 1513; no further records survive of his life. The Durham Cathedral archives show the first successor to his duties there as being a William Robson, who began his duties in 1527, and this may be an indication of Ashwell's death some time before that. Surviving Ashwell compositions Only scattered remnants of Ashwell's music survive. As was common for pre-Reformation music in England in Latin, the large majority of manuscripts were destroyed during the Dissolution of the Monasteries by Henry VIII (and a large proportion of English-language sacred music was destroyed during the subsequent reign of Mary, during her attempt to re-impose Roman Catholicism on the island). Two masses, both for six voices, survive complete in the Forrest-Heyther Partbooks, the first layer of which were copied for Taverner's use at Cardinal College in 1526-1530. With the fall of Cardinal Wolsey in 1529 the college founded by him was not able to devote resources to such music and so the manuscript was discontinued, and this situation was probably the reason for Taverner's departure that year. This first layer contains the Missa Jesu Christe (for 6 voices) and ten other works by various composers, including Taverner. The other Mass-setting (Missa Ave Maria, also for 6 voices, which is the finer of the two and an outstanding work with similarities to Taverner's Missa Gloria tibi Trinitas) was copied into the partbooks mid-century along with five other settings by other composers, though the dates of composition of both Ashwell Masses were considerably earlier: their style indicates dates of composition possibly even before his appointment at Durham. A few other works survive in other sources, mostly very fragmentary, including a fragment of