Probably the garrison had been improvident; for stores began to fall short, the water became bad, and disease broke out. Upon this, the garrison asked for time to seek and advise with Simon de Montfort, then supposed to be on the continent. This was granted, but as the sickness became pestilential, Hastings agreed to surrender on terms. Four days were allowed for the retreat of the garrison, with their horses, arms, and harness. The necessary safe-conducts bear date the 13th December, but the castle was surrendered on the 12th. The siege had lasted six months, at a prodigious expense to the royal exchequer, as Henry soon afterwards informed the sheriffs, and to the severe injury of the monks of Kenilworth and Stoneleigh, and of the people of the whole midland district, who had been harried by both besiegers and besieged. Henry left immediately afterwards for Oxford, placing Philip Marmion in charge as constable; but before leaving he, by grant dated Warwick, 16th December, made over the castle and lordship to his brother Edmund, Earl of Lancaster. Edmund was created Earl of Leicester by his nephew, Edward I., in 1274; and four years afterwards, 7 Edward I., he held a grand tournament at the castle, at which Roger Mortimer, Earl of March, specially distinguished himself. Edmund’s son and successor, Earl Thomas, enlarged the park, 30 Edward I. On his execution and attainder, the castle escheated to Edward II., who was afterwards brought here a prisoner by Henry, Earl Thomas’s brother and heir, and here retained until he was sent to Berkeley. With the new reign the attainder was reversed, and Earl Henry held the castle till his death, 19 Edward III., as did his son Henry, created Duke of Lancaster, 25 Edward III. Ten years later, on his death, 35 Edward III., Kenilworth came to his second daughter and co-heir, Blanch, who married John of Gaunt, Edward’s fourth son, who became Duke of Lancaster, 36 Edward III.