William of Rennes explained

William of Rennes, OP was a French friar in the Dominican Order, was a poet, theologian and expert on canon law. William was a Breton born in Thorigné in the thirteenth century.

William wrote an "Apparatus ad summam Raymundi", a set of annotations to the Summa de casibus poenitentiae of Raymond of Peñafort. A summa is a summary of academic theology and canon law. In 1235 William argued that the baptism without the parental consent of Jewish children was suitable as Jews had a "servile status before Christians", he maintained that just as slaves have no parental rights due to their status, this fact also held true for the Jews, and as such the forced conversion of Jewish children was acceptable.

William wrote the Arthurian epic, in Latin hexameters, which he completed just after 1236. It is similar to the by Geoffrey of Monmouth and was meant to rival the epic Alexandreis by Walter of Châtillon The is based on the legend of King Arthur, and in it he compares the conquests by Arthur to those of Alexander the Great, as an illustration of the mistakes caused by an unjust war. The poem is of interest to scholars of Arthurian literature, in that it was the first attempt to turn a medieval hero into a hero of the classical ages.

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