In recent years there have been several obvious places where an enquirer might learn about the interdict laid by Pope Innocent III on England and Wales. Powicke in the Cambridge Medieval History, Poole in the Oxford History, and Painter inThe Reign of King Johnall described this episode in the history of the English Church and discussed its bearing on political affairs. People who wanted more detail could go to two papers, published in 1948 and 1949, and would find additions to their knowledge in fragmentary documents discovered recently in the Public Record Office and the Canterbury archives, and edited by Dr Powell and Dr Barnes for the Pipe Roll Society in I960. From all these places they would receive roughly the same impression. But last year Messrs Richardson and Sayles published the first volume ofThe Governance of Mediaeval England.