Cosyn was born in Norfolk. He was educated at Corpus Christi College, Cambridge, graduating Bachelor of Divinity in 1469. He became a Fellow of Corpus Christi in 1462; and Proctor in 1470. He served as chaplain to Elizabeth Talbot, Duchess of Norfolk and held livings at Denton, Norfolk, Kelling and Landbeach. He became Master of Corpus in 1487 where he is said to have "built the buttresses in the old court" amongst other constructions and benefactions to the college.
- Alumni Cantabrigienses: A Biographical List of All Known Students, Graduates and Holders of Office at the University of Cambridge, from the Earliest Times to 1900, John Venn/John Archibald Venn Cambridge University Press > (10 volumes 1922 to 1953) Part I. 1209–1751 Vol. i. Abbas – Cutts, (1922) p400
- John Lamb (1831). "Thomas Cosyn D.D.". Masters' History of the College of Corpus Christi and the Blessed Virgin Mary in the University Cambridge.
- Thomas Wright & Harry Longueville Jones (1841). "Corpus Christi College". The universities. Le Keux's Memorials of Cambridge. 1. Tilt and Bogue, Fleet Street.CS1 maint: Uses authors parameter (link)
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