The Norman Conquest of England in 1066 gave birth to the Anglo-Norman State (ANS). This paper treats England and Normandy as one region respectively and points out a historical image of ANS. J. Le Patourel already regarded each region as dominion and adopted the name of "Anglo-Norman Empire" for ANS which consisted of both regions. C. W. Hollister pointed out that there was, in the reign of Henry I, the possibility of the establishment of the "Anglo-Norman regnum" over two regions. Thus, both scholars clarified the integrality of two regions. Le Patourel based his argument on the examination of the fiscal and judicial systems in England and Normandy. This paper examines the possibility, in the ecclesiastical field, to regard two regions a...