Background
Walter was born at Islip, Oxfordshire.
Walter was born at Islip, Oxfordshire.
He was the first Chief Baron of the Irish Exchequer. He also held the office of Treasurer of Ireland, and numerous clerical benefices. His career was damaged by accusations of corruption and maladministration.
Throughout his life Walter moved back and forth between Ireland and England.
In Ireland he usually lived at the Priory of Kilmainham, but later purchased the manor of Thorncastle, which roughly equated to modern Mount Merrion. He also seems to have had a town house since there is a reference to Dublin Corporation providing him with water.
In 1308 he was chosen as one of the Barons of the new Court of Exchequer (Ireland). He was given the title of Chief Baron in 1309, but stepped down from office in 1311.
He is mentioned again as a Baron of the Exchequer in 1335.
He served three terms as Treasurer between 1314 and 1325. In 1325 he attended a seemingly routine Exchequer audit in London, where grave irregularities came to light. Serious questions were raised about Islip"s integrity, and in one of the first examples of an official inquiry in Ireland, a Dublin jury was selected to determine the truth of the allegations of fraud and corruption against him.
Alexander de Bicknor, the Lord Chancellor of Ireland, was accused of the same offences.
Islip was finally removed from office as Treasurer, and imprisoned for a time in the Fleet Prison, although it is not clear if the charges against him were ever proved. He was subsequently appointed Custos rotulorum for Kilkenny and Escheator of Ireland.
Such conduct seems to have been most unusual even at the time: Cohen calls it "startling" and probably without parallel. De Grauntsete was soon afterwards removed from the Bench for a time, but the reason for this was not his conduct in Court, but the fact that he had read out letters of excommunication from the Pope.
In England he was vicar of Gresham, Norfolk and of Whittington, Derbyshire.
In 1318 he became Dean of Wolverhampton. In Ireland he was a canon of Saint Patrick"s Cathedral, custodian of the Archdiocese of Dublin, Treasurer of Ferns Cathedral and a prebendary in the dioceses of Ossory and Waterford.
Although Walter, unlike his cousin, did not reach the highest ranks of the Church, his career is a striking example of religious pluralism.