[5] He was summoned for military service, to a council, and to Parliament by writs directed Roberto de Insula or Roberto del Isle, [Both names meaning "of the island"], 'whereby he is held to have become Lord Lisle'.

In 1313 he was among members of the court who he attended the King and Queen (Isabella of France) to Paris.

In November 1321 he was directed to refrain from attending a meeting of peers summoned by Thomas, 2nd Earl of Lancaster.

[6] On 22 December 1336, in consideration of his 'enfeebled state', the King (Edward III) provided that he should not in future be compelled to aid the King in his wars, attend Parliament or councils, or be appointed to office; nonetheless, he was several times on commissions of the peace in Cambridgeshire until 15 March 1341, and was summoned to a council in February 1342.

He was the owner of an illuminated manuscript, the Lisle Psalter, now Arundel 83 in the British Library, given by him to his daughter Audrey, a nun, who stipulated that after her death it should go to her sister, Aubrey, also a nun, and after Aubrey's death to Chicksands Priory, which had been built on land given by the de Lisle family near their manor at Campton, Bedfordshire.