Geoffrey, the illegitimate son of Henry II, was successively archdeacon and bishop-elect of Lincoln, royal chancellor, and (for 23 years) archbishop of York, finally dying in exile during the Interdict following his opposition to John's imposition of the 13th. His enduring loyalty to his father, which inspired the subsequent mistrust of his royal half brothers after Henry's death, placed him at the very centre of late twelfth and early thirteenth century politics, especially during John's rebellion during the early years of the Third crusade. Moreover, during most of his time as archbishop his turbulent personality brought him into direct opposition to his cathedral chapter at York, which in turn throws further light on the ecclesiastical politics of the period. He also endured two long periods of exile, and he remains one of the very few bishops in the medieval English church for whom even a partial contemporary biography survives. This edition collects together for the first time Geoffrey's acta as archbishop, and Dr Lovatt's introduction provides a much needed modern account of this intriguing character.