XIR173465 Ms 360 f.264v Tree of Consanguinity, from the \'Decrets de Gratien\' (vellum) by French School, (14th century); Bibliotheque Municipale, Amiens, France; (add.info.: The Decretum Gratiani, also known as the Concordia discordantium canonum or Concordantia discordantium canonum, is a collection of Canon law compiled and written in the 12th century as a legal textbook by the jurist known as Gratian. consanguinity is the quality of being descended from the same ancestor as another person. The laws of many jurisdictions set out degrees of consanguinity in relation to prohibited sexual relations and marriage parties or whether a given person inherits property when a deceased person has not left a will); French, out of copyright.