From 1279 to 1642, the registers are the principal record of the Archbishop's administration. After the Restoration the registers were superseded in importance by the Archbishops' Act Books, part of the Vicar General archive.
The registers include institutions and appointments of clergy, grants of dispensations, ordinations, appointments of bishops, sede vacante administration of suffragan sees, diocesan and metropolitical visitations by the archbishop, visitation of monasteries, records of convocation, and heresy trials.
There are a large number of published finding aids to Archbishops' Registers (details attached right).
A micropublication of the Archbishops' Registers, 1272-1640 is available from World Microfilms Publications. This also includes the cartulary of the see of Canterbury (MS 1212).