Weseham was probably a native of Weasenham, Norfolk,[1] and was educated at Oxford University.
[3] He was Archdeacon of Oxford by May 1237 until 1240, when he was appointed Dean of Lincoln by Robert Grosseteste, who had made Roger a protégé.
[4] While bishop, Weseham wrote an Instituta for his clergy, in order to teach them Christian doctrine and help them select sermon topics.
[5] One of the subjects he wanted his clergy to cover the basics tenets of the Christian faith.
[6] He also gathered learned men around him, including the Franciscan Brother Vincent, John of Basingstoke, a Greek scholar, and Ralph de Sempringham, who became Chancellor of the University of Oxford.