The main framework of the whole rectangular structure probably dates from Gundulf's or, at the latest, from Bishop Ralph's time; the simple plan and the walls, 3 feet in thickness, being such as might be expected in early Norman work. The building, which has a total length of 70 feet, is of stone, with a tiled roof, and now forms dwelling-houses. It has a massive buttress in the centre of the southern face, and the outlines of old windows can be traced in various parts. The western gable end, which can be seen from Boley Hill, is also interesting and worthy of attention. The cellars and vaulted passages extend even beyond the building to the eastward, and are very massive in their construction. Fragments of wrought masonry that probably once belonged to the chapel have been dug up; they were mostly portions of capitals, with beautiful foliated ornaments, or of column shafts. Cardinal Fisher was the last Bishop of Rochester to reside here. He received a visit from Erasmus in 1516, and this great scholar gave a very bad account of the residence and its situation. Fisher himself complained of its dilapidated state and of the rats that infested it. Cardinal Wolsey stayed at the house with the bishop on the 4th of July, 1527, and wrote to the king on the next day: "I was right loveingly and kindely by him entertained." After his cook's attempt, in 1531, to poison him and his family at his London house, on Lambeth Marsh, Fisher stayed continuously at Rochester, until, in 1534, he was peremptorily summoned to the capital--never to return. The palace was continued to the bishops by the charter constituting the new establishment, but they neither inhabited it nor, in fact, lived much at Rochester at all. On the spot where its old prison used to stand within the palace precincts, the diocesan Register Office was erected in 1760. The building at present known as the palace, in St. Margaret's Street, has often been thought to be the old mansion with all these historical associations; it did not, however, become the property of the bishops until after 1674. In that year it was bequeathed by Francis Head, Esq., to his wife, with the arrangement that, after her death, "in case the Church of England does continue so governed by Bishops of the true Protestant faith," it should be settled on the Lord Bishop of Rochester and his successors for the maintenance of hospitality near the cathedral church, and as an invitation to him to preach once a year each at the churches of St. Margaret and St. Nicholas in his cathedral city. This building has been little used by the bishops, and has generally been leased by them, like other residences of theirs, of which mention will be made in the chapter on the see and its history. The small episcopal revenue has usually only allowed of the maintenance of a single palace, though more may have been desired and even necessary. [Illustration: ARCHWAY IN THE ROMAN WALL (FROM A PHOTOGRAPH BY H. DAN).]