On the death of Walter Fitzsimon in 1511, Rokeby became Archbishop of Dublin. He was Lord Chancellor of Ireland from 1512 to 1513 and from 1516 to 1522. O'Flanagan believes that he was a good and diligent Lord Chancellor, although he did not leave behind many written judgments. He was clearly a trusted servant of the Crown: in particular the Lord Deputy, Surrey, with the approval of Henry VIII, chose Rokeby in 1520 as mediator in the feud, which had become exceptionally bitter, between Maurice FitzGerald, 9th Earl of Desmond and Piers Butler, 8th Earl of Ormond. As Archbishop he also made a reputation as a peacemaker, settling a long and bitter dispute between the Dean and Chapter of St. Patrick's Cathedral. He gave permission to Gerald FitzGerald, 9th Earl of Kildare for the original foundation of Maynooth College, which was suppressed in 1535. He was frequently at the English Court, so often in fact that he was accused of neglecting his official duties. He participated in the christening of the futureQueen Mary I in 1516 and the ceremony by which Wolsey received his cardinal's hat. As Archbishop of Dublin he is best remembered for the Synod of 1518. The Synod prohibited the use of any tinchalice at Mass, and the disposal of Church property by laymen; and attempted to regulate the procedure for dealing with intestate estates, the payment of tithes and burial fees and the rules for admission to the clergy. Rather comically, Rokeby strictly forbade clergymen to play football. He was appointed Archdeacon of Surrey on 27 March 1519. By 1521 his health was failing: he retired to Kirk Sandall and died there on 29 November.
The Rokeby Chapels
Rokeby made elaborate provision in his will for the disposal of his remains: he asked that his body should be buried in Halifax, but that his heart should be buried in St Oswald's Church, Kirk Sandall, and that mortuary chapels be erected at both spots. The Rokeby chapels in St Oswald's and Halifax Minster still exist.
Character
O'Flanagan praises Rokeby as a good man, a good bishop and, so far as we can tell from the scanty records, a good judge. Elrington Ball, while acknowledging his good qualities, suggests that he was a failure as Irish Lord Chancellor, due partly to his frequent absences in England.