Ullerston was born in the Duchy of Lancaster, England. Having been ordained priest in December, 1383, he became a Fellow of Queen's College, Oxford (1391–1403), holding office in the college, and proceeding to Doctor of Divinity and Vice-Chancellor of Oxford University in 1394. In 1408, he became Chancellor of the University and in the same year wrote at the request of the Bishop of Salisbury a sketch of proposed ecclesiastical reforms: "Petitiones pro ecclesiae militantis reformatione".
Ullerston wrote a commentary on the Creed (1409), one on the Psalms (1415), another on the Canticle of Canticles (1415), and "Defensorium donationis ecclesiasticae", a work in defence of the donation of Constantine. At the request of Archbishop Courtenay he wrote a treatise, "De officio militari" 'On the military office', addressed to Henry, Prince of Wales.
| Vice-Chancellor of the University of Oxford
| Chancellor of the University of Oxford
- Wood, Anthony (1790). "Fasti Oxonienses". The History and Antiquities of the Colleges and Halls in the University of Oxford. Google Books. p. 37.
- "Appendix 6: Vice-Chancellors of the University". The Encyclopaedia of Oxford. 1988. pp. 523–526.
- "Appendix 5: Chancellors of the University". The Encyclopaedia of Oxford. 1988. pp. 521–522.
- University of Oxford (1888). "Vice-Chancellors". The Historical Register of the University of Oxford. Oxford: Clarendon Press. pp. 21–27. Retrieved July 24, 2011.
- Herbermann, Charles, ed. (1913). Catholic Encyclopedia. New York: Robert Appleton Company. .
- Dictionary of National Biography. London: Smith, Elder & Co. 1885–1900. .
- Hibbert, Christopher, ed. (1988). The Encyclopaedia of Oxford. Macmillan. ISBN 0-333-39917-X.
- This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). . Catholic Encyclopedia. New York: Robert Appleton.
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