De Bicknor came to the Dublin see during a time of considerable domestic and foreign troubles, including the continuous chafing of the Gaelic Irish against English rule (of which Bicknor was a chief representative) and the struggles between the Scots under
Robert Bruce and the English crown, which frequently spilt over into Ireland. De Bicknor was one of the archbishops who promulgated the excommunication of Bruce in 1318. Among the most notable domestic disturbances was the rebellion of Edward II's queen,
Isabella of France, against the King and his favourites, the
Despensers in 1324. During the early 1320s, de Bicknor was actively engaged in diplomacy on several missions to France. During one of these, facing a French siege and general military and diplomatic debacle, he advised the
Earl of Kent to surrender the fortress of
La Réole to the French, in effect recognising the defeat of the English attempting to defend the
Duchy of Aquitaine. Shortly thereafter de Bicknor went over to the side of the Queen, who had openly taken the powerful and ambitious English noble
Roger Mortimer as a lover while in France. The archbishop at one point even declared that he would have challenged Hugh Despenser the Younger to a duel if it had not been contrary to his ecclesiastic position. Edward responded with an extensive list of most likely legitimate accusations to the Pope of various sorts of malfeasance in office, including his attacks on the Despensers. These opened the door to the discovery of extensive problems in de Bicknor's accounts, and in particular substantial arrears to the Church itself, non-payment of which in part led to de Bicknor's excommunication. But in the end, de Bicknor had chosen the winning side, and Edward was forced to abdicate in 1327 in favour of his son
Edward III, at the time still controlled by Isabella and Mortimer. The former king is thought to have been executed under uncertain circumstances later in the same year. In the late 1320s, the darkest period of de Bicknor's career began to unfold, when further accounting fraud during his administration was uncovered, or at least ceased to be tolerated.
Walter de Islip, the
Lord Treasurer of Ireland, was also deeply implicated in the fraud. If de Bicknor had expected his support for the new regime to excuse him, he was disappointed, as his assets and holdings were seized by the crown. After this point, de Bicknor's role in national politics diminished substantially. His difficulties became only deeper when he apparently attempted to falsify a royal pardon (ironically, for the crime of fraud). When Edward III came of age in 1330, he had Mortimer brutally executed and Isabella was forced to live out the rest of her life under what was, in essence, house arrest, so de Bicknor's fate was relatively mild compared to that of his erstwhile patrons and allies. More remarkably, he eventually obtained an authentic pardon from Edward III. He visited England in 1332, possibly in connection with the pardon. == Later ecclesiastical disputes ==