(fl. 1253–85). English master-mason. He worked on the choir and transept of Beverley Minster, Yorks. (completed c. 1260), and from 1253 was engaged on work at Westminster Abbey and Palace. In 1260 he became King's Master-Mason and Chief Mason of Westminster Abbey. In 1271 he became Surveyor of the Royal Works at the Tower of London, the castles of Windsor, Rochester, and Hadleigh, and the manors of Guildford, Kempton, and Havering. He designed the Byward and Middle towers of the Tower of London, complete with their beautiful internal vaults. These works and his contributions at Westminster Abbey (including the first four bays of the nave) have assured him a secure place in the history of English architecture. He was no mean sculptor, either, and was responsible for the image of King Henry III (1276) from which the famous effigy was copied.
From A Dictionary of Architecture and Landscape Architecture in Oxford Reference.