[1] In 1256 Derlington persuaded the king to release a converted Jew of Lincoln, imprisoned on suspicion of complicity in the murder of a child.
[1] In August 1278 Derlington was part of a mission to Rome from Edward I with William of Louth and Henry of Newark.
The collection of the "tenth" was a long task, but it had hardly begun when Derlington was raised to the see of Dublin, which had been vacant since the death of Fulk Basset in 1271.
The appointment was the Pope's personal choice, made to resolve a confusing situation involving a bitter struggle between two rival nominees, Fromund Le Brun and William de la Corner.
The contentious collection of the tenth kept Derlington from his see, and the king allowed him to be represented by an attorney in Ireland, and gave him special license to remain in England.