An archdeacon represents the diocesan bishop in his or her archdeaconry. Many Anglican dioceses group parishes within an archdeaconry into subdivisions known as deaneries. Some churches of the Anglican Communion have deaneries as units of an archdeaconry. Seahouses is in the Anglican archdeaconry of Lindisfarne, in the Diocese of Newcastle. Grosseteste expanded it to include all the deaneries in each archdeaconry of his vast diocese. However, in 1837 the archdeaconry was placed under the control of the Diocese of Lincoln. "Cleveland" is a Church of England archdeaconry, in the Diocese of York. This archdeaconry had been separated from the original archdeaconry of Suffolk in 1127. The bishop is based in Reading, and is responsible for the archdeaconry of Berkshire. The archdeaconry around Salisbury, however, retains the name of Sarum. Karden was the centre of an archdeaconry. William Longchamp fulfilled the same assistant role for the archdeaconry at Rouen. Tingwall was also the base of the Archdeaconry in Shetland. It falls within the Lafford Deanery, the Lincoln Archdeaconry and the Diocese of Lincoln. He or she is the priest responsible for the Archdeaconry of Hampstead.