Coronet This ornament first appears in the effigy of John of Eltham, who died in 1332. The addition of a marquis' coronet to an archiepiscopal mitre does not date back before the time of Sheldon. Edmundson speaks of it as a novelty. It has since then been drawn as a ducal coronet. The bishops of Durham, who took their title by the grace of God or by divine providence (in distinction from other bishops, who are styled, by divine permission), while still palatine, until 1833, used the coronet by right, or in lieu of it a plume of feathers.