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
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