Few medievalists today would deny that the massive social and economic changes of the central Middle Ages affected the character and institutions of medieval Christianity. Generations of scholars, especially those influenced by the Annales school, have explored the social and economic roots of religious change. Despite widespread acceptance of the connection between socioeconomic factors and religious change, detailed explanations of exactly how social and economic development transformed medieval Christianity are still lacking for numerous important issues. My goal here is to (...) address one such issue: the connection between the emergence of new social groups and the development of new kinds of ecclesiastical institutions. (shrink)