police chief into seizing Gatteschi's papers, including the letters, which were then destroyed. Shortly afterwards, Mary Shelley bought some letters written by herself and Percy Bysshe Shelley from a man calling himself G. Byron and posing as the illegitimate son of the late Lord Byron. Also in 1845, Percy Bysshe Shelley's cousin Thomas Medwin approached her claiming to have written a damaging biography of Percy Shelley. He said he would suppress it in return for £250, but Mary Shelley refused.According to Bieri, Medwin claimed to possess evidence relating to Naples. Medwin is the source for the theory that the child registered by Percy Shelley in Naples was his daughter by a mystery woman. See also, Journals, 249–50 n3. In 1848, Percy Florence married Jane Gibson St John. The marriage proved a happy one, and Mary Shelley and Jane were fond of each other. Mary lived with her son and daughter-in-law at Field Place, Sussex, the Shelleys' ancestral home, and at Chester Square, London, and accompanied them on travels abroad. Mary Shelley's last years were blighted by illness. From 1839, she suffered from headaches and bouts of paralysis in parts of her body, which sometimes prevented her from reading and writing. On 1 February 1851, at Chester Square, she died at the age of fifty-three from what her physician suspected was a brain tumour. According to Jane Shelley, Mary Shelley had asked to be buried with her mother and father; but Percy and Jane, judging the graveyard at St Pancras to be "dreadful", chose to bury her instead at St Peter's Church, Bournemouth, near their new home at Boscombe. On the first anniversary of Mary Shelley's death, the Shelleys opened her box-desk. Inside they found locks of her dead children's hair, a notebook she had shared with Percy Bysshe Shelley, and a copy of his poem Adonaïs with one page folded round a silk parcel containing some of his ashes and the remains of his heart. Literary themes and styles Mary Shelley lived a literary life. Her father encouraged her to learn to write by composing letters, and her favourite occupation as a child was writing stories. Unfortunately, all of Mary's juvenilia were lost when she ran off with Percy in 1814, and none of her surviving manuscripts can be definitively dated before that year. Her first published work is often thought to have been Mounseer Nongtongpaw, comic verses written for