Ely Cathedral, formally the Cathedral Church of the Holy and Undivided Trinity, is an Anglican cathedral in the city of Ely, Cambridgeshire, England. The cathedral has its origins in AD 672 when St Etheldreda built Ely Abbey. The present building dates back to 1083, and it was granted cathedral status in 1109. Until the Reformation it was the Church of St Etheldreda and St Peter, at which point it was refounded as the Cathedral Church of the Holy and Undivided Trinity of Ely, continuing as the principal church of the Diocese of Ely, in Cambridgeshire. It is the seat of the Bishop of Ely and a suffragan bishop, the Bishop of Huntingdon. Architecturally, it is outstanding both for its scale and stylistic details. Having been built in a monumental Romanesque style, the galilee porch, lady chapel and choir were rebuilt in an exuberant Decorated Gothic. Its most notable feature is the central octagonal tower, with lantern above, which provides a unique internal space and, along with the West Tower, dominates the surrounding landscape. Ely Cathedral is a major tourist destination, receiving around 250,000 visitors per year, and sustains a daily pattern of morning and evening services. Anglo-Saxon abbey Ely Abbey was founded in 672, by Æthelthryth (St Etheldreda), daughter of the East Anglian King Anna. It was a mixed community of men and women. Later accounts suggest her three successor abbesses were also members of the East Anglian Royal family. In later centuries the depredations of Viking raids may have resulted in its destruction, or at least the loss of all records. It is possible that some monks provided a continuity through to its refoundation in 970, under a Benedictine rule. The precise siting of Æthelthryth's original monastery is not known. The presence of her relics, bolstered by the growing body of literature on her life and miracles, was a major driving force in the success of the refounded abbey. The church building of 970 was within or near the nave of the present building, and was progressively demolished from 1102 alongside the construction of the Norman church. The obscure Ermenilda of Ely also became an abbess sometime after her husband, Wulfhere of Mercia, died in 675. Present-day church The cathedral is built from stone quarried from Barnack in Northamptonshire (bought from Peterborough Abbey, whose lands included the quarries, for 8,000 eels a year), with decorative elements carved from Purbeck