The aim of this article is to evaluate the frequency of the infinitive clauses functioning as objects (AcI: Accusatiuus cum Infinitiuo) used by Caesarius of Arles in his Sermons and to examine the contextual, syntactic and word order conditions of their utilisation. The analysis of a number of texts shows that the AcI is still well represented at the end of the 5th and at the beginning of the 6th centuries, and that it coexists with quod and quia completive clauses, and that it seems that Caesarius can use either of these syntactic options indifferently, as shown by the couple formed by dicere quod ... (Serm. 5.3) and dicere […] mala uiris licere (Serm. 42.3). However, the AcI is generally used in clear and simple syntactic constructions, situated close to the governing verb which must be easily detectable. But a closer look reveals that in many of these cases, the accusative subject of the AcI is a reflexive pronoun. One may wonder whether, at a time when the paradigm of pronominal verbs was being formed, such structures did not already contain this new pronominal type of verb and if they were not the beginning of French expressions such as: Il / elle se dit / s’est dit(e) capable de traiter cette question ("He / she says / said he / she was able to handle this issue").