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Sir Ralph de Hengham (d 1311) was the Lord Chief Justice of Edward I from 1274-1290, when he was imprisoned and fined for corruption. He continued as a judge of the common pleas, and was the reputed author of the law tracts 'Hengham magna' and 'Hengham parva'.
At a date some time after 1139 (probably 1140), Johannes Gratian compiled the Church laws (`canons') from all available sources and called the collection Concordia Discordantium Canonum (the harmonizing of discordant canons). The collection became known as the Decretum Gratiani.
The Digestum Novum was a section of the Digests or Pandects of the Corpus Iurus Civilis organised by the Roman emperor Justinian I, which compiled the writings of the great Roman jurists such as Ulpian along with current edicts (533).
Aristotle (384-322 BC) was a Greek philosopher who was the student of Plato and tutor of Alexander the Great. His De anima (On the Soul) was a discussion of issues in the philosophy of mind.