After the death of his father in 1225, the young Roger became the ward of William Longespée, 3rd Earl of Salisbury.
Roger was already a wealthy magnate, but in 1248 he received vast lands in south Wales and Ireland on the death of his mother.
Responsible for keeping order around the king, in peacetime the marshal performed a ceremonial and judicial role, with lucrative rights, such as securing gifts from newly created knights.
[citation needed] In 1258, Roger was at the head of a rebel group of barons and knights who marched on Westminster Hall, compelling the king to accept major constitutional reforms, known as the Provisions of Oxford.
Despite having other property around the country, Roger always retained his strong East Anglian loyalties.