One of our most celebrated castles of defence is Corfe Castle, in Dorset, a remarkable specimen of mediæval military architecture. The earliest notice of this fortress is in an Anglo-Saxon charter of the year 948. In 981 Corfe was the scene of the murder of King Edward the Martyr. After the death of his father, Edgar, Elfrida, his widow, headed a faction in opposition to the accession of Edward, and continued her intrigues until her unscrupulous ambition at last led her to the perpetration of a deed which has covered her name with infamy. This was the murder of her step-son by a hired assassin, as he stopped one day while hunting, at her residence, Corfe Castle; he was stabbed in the back, as he sat on his horse at the gate of the castle, drinking a cup of mead. The 18th of March, 978, is the date assigned to the murder of King Edward, who was only in his seventeenth year when he was thus cut off. He is retained in the calendar of the Anglican Church as a saint and martyr. The castle, which was the strongest fortress in the kingdom, formed an irregular triangle, the apex of which was connected by a narrow isthmus with the high ground, on which the town of Corfe stands. The isthmus had been cut through, and the ditch thus formed was spanned by a stately bridge of arches leading to the principal entrance of the fortress. Only the south side and parts of the east and west sides of the keep are standing, and large masses of prostrate walls lie in confusion around. The keep is Norman, believed to have been built by the Conqueror. King John kept his treasure and regalia here, and used the castle as a state prison. Twenty-four nobles concerned in the insurrection by his nephew, Arthur, Duke of Brittany, were, save two, it was said, there starved to death. King John caused Prince Arthur to be murdered, and sent his sister, the beautiful Princess Eleanor, prisoner to Corfe, where she remained several years.