of madness during this period but modern interpretations suggest, at worst, a nervous breakdown following the death of Mortimer. Isabella remained extremely wealthy; despite being required to surrender most of her lands after losing power, in 1331 she was reassigned a yearly income of £3000, which increased to £4000 by 1337. She lived an expensive lifestyle in Norfolk, including minstrels, huntsmen, grooms and other luxuries, and was soon travelling again around England. In 1348, there were suggestions that she might travel to Paris to take part in peace negotiations, but eventually this plan was quashed. She was involved in the talks with Charles II of Navarre in 1358. As the years went by, Isabella became very close to her daughter Joan, especially after Joan left her unfaithful husband, King David II of Scotland, who was imprisoned by her brother in the Tower of London at the time where she visited him once. Joan nursed her just before she died. She doted on her grandchildren, including Edward, the Black Prince. She became increasingly interested in religion as she grew older, visiting a number of shrines. She remained, however, a gregarious member of the court, receiving constant visitors; amongst them appear to have been her friend Marie de St Pol, Countess of Pembroke, and her cousin Henry of Grosmont, Duke of Lancaster. King Edward and his children often visited her as well. She remained interested in Arthurian legends and jewellery; in 1358 she appeared at the St George's Day celebrations at Windsor wearing a dress made of silk, silver, 300 rubies, 1800 pearls and a circlet of gold. She may have developed an interest in astrology or geometry towards the end of her life, receiving various presents relating to these disciplines. Isabella took the nun's habit of the Poor Clares before she died on 22 August 1358 at Hertford Castle, and her body was returned to London for burial at the Franciscan church at Newgate, in a service overseen by Archbishop Simon Islip. She was buried in the mantle she had worn at her wedding and at her request, Edward's heart, placed into a casket thirty years before, was interred with her. Isabella left the bulk of her property, including Castle Rising, to her favourite grandson, the Black Prince, with some personal effects being granted to her daughter Joan. Cultural depictions Literature and theatre Queen Isabella appeared with a major role in