Robert married Edith Forne, daughter of Lord Greystoke, who had been King Henry I of England's concubine, in 1120.
[1] By 1141 Robert had inherited his father's position of Lord of Oxford Castle and Baron Hocknorton and it was he that declared his support for Empress Matilda against King Stephen, giving her protection in Oxford between 1141 and the winter of 1142.
[1] It is because of this action that Stephen came to Oxford and besieged the castle for three months, burning the city down in the process.
Matilda supposedly escaped by dressing in white as a form of camouflage against the snow-covered ground, and fleeing across the frozen Castle Mill Stream.
Henry became 4th Baron Hocknorton and Kings Constable and married Margery, daughter of Humphrey de Bohun, Earl of Hereford.