Warenne also served in financial matters, being one of those responsible for collecting taxes and later overseeing debts from Christians to Jews.
The historian Ralph V. Turner said of Warenne that "although he was a longtime official under King John, he did not quite fit into the inner corps of royal counselors".
[4] In 1195 Warenne served as a royal justice at Oxford with Hubert Walter, William Brewer and Geoffrey of Buckland.
[7] Besides judicial duties, Warenne also served in other capacities, working with Barre and Osbert fitzHervey to collect the carucage in 1194 in eastern England.
A sign of further ties between the two was that Warenne served as a witness on Walter's charters founding a monastery at West Dereham.
[14] Warenne's only surviving child and sole-heiress was his daughter, Beatrice, whom he married to Doun Bardolf, the holder of a one-half moiety of the feudal barony of Shelford in Nottinghamshire.