As regards candidates for ecclesiastical offices, the concordats concluded with Catholic nations regularly give the sovereign the right to nominate or present to bishoprics, often also to other inferior benefices, such as canonries, important parishes and abbeys; or at least the choice of the ecclesiastical authority is submitted to the approval of the civil power.
And Archbishop Winchelsey were among his clients, and his legal services secured for him canonries at Hereford and St Paul's, and the precentorship of Exeter Cathedral.
A third statute disqualified plebeians from being elected to canonries or bishoprics.
He was presented to two canonries in the churches of St John Lateran and Sta Maria Maggiore, although he had only taken the minor orders, and had never been consecrated priest; he negotiated the treaty of Turin between France and Savoy in 1632, became vice-legate at Avignon in 1634, and nuncio at the court of France from 1634 to 1636.
In his accumulation of benefices Wykeham seems to have distanced all his predecessors and successors, except perhaps John Maunsell, the chancellor of Henry III., and Thomas Wolsey, the chancellor of Henry VIII., the latter being a pluralist not in canonries and livings but in bishoprics.