Paul Magdalino 
The Perception of the Past in 12th Century Europe [PDF ebook] 

The way people see the past tells us much about their present interests and about their sense of identity. This book examines both what men of the day knew about their past, and in particular about the Roman Empire, and shows how such knowledge was used to authenticate claims and attitudes. These original essays, by distinguished scholars, are wide-ranging both geographically, from Russia to Iberia, and in scope, dealing with legal, ecclesiastical, noble and scholarly attitudes.