(c.735-804) Master of the cathedralCathedral (Latin cathedra' throne') Church which contains the throne of the bishop and hence the mother church of the diocese school in YorkYork 1. A Roman city and early centre of Christianity. 2. Diocese and province under the leadership of the Archbishop of York.. Adviser to Emperor Charlemagne. Wrote on theologyTheology (Literally 'words about God') Ideas about the nature of God and church doctrine. Theological ideas have constantly changed and developed throughout church history., liturgy, grammar and logic.