The four volumes of Robert Surtees’s great History and Antiquities of the County Palatine of Durham, which were published between 1816 and 1840, included a series of engraved plates of episcopal seals. They started in the eleventh century, with the seal of William of St Carilef, and ended in the sixteenth century, with Cuthbert Tunstall. According to a note in the late volume, written by Surtees’s friend, helper, and literary executor, James Raine, in 1839, five years after the author’s death, ‘The Seals of the Bishops of Durham, after Tunstall’s period, are so devoid of taste and character, that Mr Surtees did not consider them worthy of being engraved.’ While the aesthetic judgement that explained this decision may be understandable, historical and iconographie interests now make it regrettable. For it was precisely at this time, after the death of Cuthbert Tunstall in 1559, that reforming dictates began to have an impact on episcopal seal-making. And, as was realized by G. C. Gorham less than twenty years after Raine’s note, changes in ecclesiastical seals reflect wider issues in church affairs, and may be revealing of their owners’ opinions.