His appointment as Lord Chief Justice of Ireland is dated 25 June 1426, and for a short period his name occurs several times in the Calendar of the Irish Chancery Rolls. From these entries, which contain all that is known of his career, it appears that a salary was assigned to him of forty pounds per annum, which was soon afterwards altered to forty pence per diem, in addition to the custody of certain manors. Fortescue held his appointment only for seventeen months, and was ‘relieved’ from it by the king's writ on 8 November 1427.
Almost immediately afterwards he was commissioned by the Parliament of Ireland to accompany Sir James Alleynon a mission to England, to lay before the king the grievances of his Irish subjects. Again, in 1428, he was sent with Sir Thomas Strange by the lords and commons assembled in Dublin, with the concurrence of Sir John Sutton, the lord-lieutenant, with a number of articles of complaint to be laid again before the king. One of the grievances which he was instructed to represent related to the insults and assaults made upon himself and Sir James Alleyn during their former mission, from which it may be concluded that their first visit to the court had not met with much success. The other griefs for which the parliament prayed redress related to the frequent changes of governors and justices, to the debts left behind them by each successive lord-lieutenant, to the exclusion of Irish law students from the English Inns of Court, and to the treatment of Irishmen travelling in England. There is no further mention of Fortescue in the ‘Patent Rolls,’ nor is anything known as to his after life, beyond the record of an action brought against him to recover certain lands in Nethercombe, Devonshire.
Firstly to Joan Boyun, daughter and heiress of Edmund Boyun of the manor of Wood, in the parish of Woodleigh, South Devon;
Secondly to the daughter and heiress of Nicholas de Fallopit of the manor of Fallopit in the parish of East Allington, South Devon.
He left sons by each wife, who each inherited their respective mother's properties, and founded two branches of the Devonshire family of Fortescue. The Fallopit branch soon ended in an heiress, Elizabeth Fortescue, who took the manor by marriage to her cousin Lewis Fortescue, a younger son of the Fortescues of Spridleston, in Brixton, Devon, who was a Baron of the Exchequer under King Henry VIII. Their descendant, Anne Hals, married the Rev John Tindal, father of Dr Matthew Tindal and great great grandfather of Sir Nicholas Conyngham Tindal, Chief Justice of the Common Pleas.
