The Liber Censuum Romanæ Ecclesiæ (Latin for "Census Book of the Roman Church"; also referred to as the Codex of Cencius)[1] is an eighteen-volume (originally) financial record of the real estate revenues of the papacy from 492 to 1192. The span of the record includes the creation of the Apostolic Camera[2] and the effects of the Gregorian Reform.[3] The work constitutes the "latest and most authoritative of a series of attempts, starting in the eleventh century, to keep an accurate record of the financial claims of the Roman church".[4] According to historian J. Rousset de Pina, the book was "the most effective instrument and [...] the most significant document of ecclesiastical centralization" in the central Middle Ages.[4]
Michael Ott considers the Liber Censuum "perhaps the most valuable source for the history of papal economics during the Middle Ages".[5]
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