He was summoned to attend the king at Salisbury 24 February 1296/7 and to a military council at Rochester 8 September 1297.
In 1297 the Sheriff of Dorset was ordered to provide housing within Sherborne Castle for John and his wife "to live in during the king's pleasure".
Although he was not summoned to the Parliament at Lincoln[2] in 1301, he was one of the signatories to the Barons' Letter of 1301 sealed at that Parliament by seven English earls and 96 English barons to Pope Boniface VIII as a repudiation of his claim of feudal overlordship of Scotland (expressed in the Bull Scimus Fili), and as a defence of the rights of King King Edward I of England as overlord of Scotland.
His surviving seal displays his arms two bars three roundels in chief (tinctures not apparent) with legend: S(IGILLUM) JOH(ANN)IS DE MOLIS[3] ("seal of John de Moels").
[2] His principal landholdings were: Cadbury and Mapperton in Somerset; King's Carswell, Diptford and Langford in Devon; Little Berkhampstead in Hertfordshire; Over Orton and Stoke Basset in Oxfordshire.