[clarification needed] In this role, he escorted merchant convoys and broke a French blockade to provide supplies to the besieged fortresses of Bourg and Blaye.
After the 1303 Treaty of Paris restored Gascony to the English, Barrau was appointed castellan of Bayonne and bailiff of Labourd, serving until 1304.
[6] Historian Malcolm Vale regards the appointment of Barrau as one of Edward and John II, Duke of Brittany's wisest moves.
Barrau's pension was financed by land confiscated from foreigners in England and provided 50 pounds chipotenses, a Gascon currency, per annum: a total of around £10 (equivalent to £10,250 in 2023).
[3]: 29 Following the 1303 Treaty of Paris, which restored Gascony to the English crown, Barrau served as castellan of Bayonne and bailiff of Labourd from 5 August 1303 to 11 April 1304.
[11] His clerk, Fortz de Pegeres, was out of service by 1305 when he petitioned the king for employment or a pension as his and his brothers' homes in Roquetaillade and Castelnau-de-Sarneis had been destroyed by the French in war.