Old St Paul's Cathedral in length including the portico, and across the transepts, and Winchester Cathedral, the longest remaining medieval church, is long and across the transepts. The cathedral had one of Europe's tallest church spires, the height of which is traditionally given as , surpassing all but Lincoln Cathedral. The King's Surveyor, Christopher Wren (1632–1723), judged that an overestimate and gave . William Benham noted that the cathedral probably "resembled in general outline that of Salisbury, but it was a hundred feet longer, and the spire was sixty or eighty feet higher. The tower was open internally as far as the base of
The Spire the warnings of the master builder, Roger Mason. The cathedral has insufficient foundations to support a spire of the magnificence demanded by Jocelin, but he believes he has been chosen by God and given a vision to erect a great spire to exalt the town and to bring its people closer to God. As the novel progresses, Golding explores Jocelin's growing obsession with the completion of the spire, during which he is increasingly afflicted by pain in his spine (which the reader gradually comes to realise is the result of tuberculosis). Jocelin interprets the burning heat in his back as