An example of meningiomatous hyperostosis from medieval Rochester.

INTRODUCTION At the invitation of the Dean and Chapter of Rochester Cathedral, the Canterbury Archaeological Trust carried out an excavation within the Lay cemetery of the Cathedral during April and May 1990. This project, funded by the Cathedral authorities, was undertaken before work began on the consolidation of the foundations of the Chair Store, which is situated between the west side of the north transept and the north side of the nave (fig. 1). The excavation consisted of three small trenches (marked A, B and C) each 3 m x 1 m, and up to 4.5 m deep.