At his brother's death, Roger was a minor, born a few years before his father's departure in 1222. Paying homage to Henry III in 1241 he took livery of his heritage. It seems he had a fairly domestic life until 1257 as he is recorded as applying for, and being granted a licence for a fair at Hovingham, Yorkshire and he visited the northern monasteries confirming many charters of land made to the monks by his great-grandfather, Roger de Mowbray.

In 1258 he was summoned for military service against the Scots (amongst whose ranks was his cousin Roger, son of Philip de Mowbray). Two years later he was ordered to be at Chester to serve against the Welsh, and was appointed by the King to dictate the English terms of the truce with Llewelyn. For these services Roger was given a robe for Christmas !

In 1258 Simon de Montfort had come to the forefront of a rebellious group of barons, culminating in the Battle of Evesham in 1265 where they were defeated. Roger sided with the crown in this struggle for power, but all this took toll of his physical resources and he died in 1266, being buried in the church of the Friars Preachers in Pontefract, Yorkshire.

Roger had married Maud de Beauchamp, by whom he had a son and heir, Roger.

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