Guillaume of Sauqueville was a quite unknown dominican preacher. Ail of we know about him is a sermon's collection of 106 pièces de tempore and de sanctis in five european manuscripts. In order to study his prédication's way we fïrst propose a complète and scientifîc édition of the sermon's collection : this work had never been completed until now. Guillaume of Sauqueville preached in Paris at the end of the reign of Philip the Fair, he well knows the académie organisation of his time and was probably student in the Collège of Sorbonne. Guillaume is not well-known, he is not one of the famous académie teachers of the XTVth century and ail of we clearly know now about him is this sermon's collection. This work shows an effective way of prédication which serves a theological and moral content. Guillaume wants to compose sermons that every one can understand : he uses latin language, but also french. The collection also shows his composition's style, for example how Guillaume uses working tools like the Manipulus florum, a médiéval florilège of citations. At last, the favourite thèmes of Guillaume clearly show that he is concerned by political questions, not only pastoral, and especially by three main powers of this time : the university of Paris, the clergy and the french monarchy.
