 The cathedrals fall into three distinct groups, depending on their earlier organisational structure. Firstly, there are those that, during the Medieval period as now, were governed by a body of secular clergy or chapter, presided over by a dean. These cathedrals are Chichester, Exeter, Hereford, Lichfield, Lincoln, London, Salisbury, Wells, and York, all of which built specifically to serve as cathedral churches.
