For many centuries, from at least the time of Jerome (c. 347 – 420), the term "Chaldean" indicated the Aramaic language and was still the normal name in the nineteenth century. Only in 1445 did it begin to be used to mean Aramaic speakers in communion with the Catholic Church, on the basis of a decree of the Council of Florence, which accepted the profession of faith that Timothy, metropolitan of the Aramaic speakers in Cyprus, made in Aramaic, and which decreed that "nobody shall in future dare to call [...] Chaldeans, Nestorians". Previously, when there were as yet no Catholic Aramaic speakers of Mesopotamian origin, the term "Chaldean" was applied with explicit reference to their "Nestorian" religion. Thus Jacques de Vitry wrote of them in 1220/1 that "they denied that Mary was the Mother of God and claimed that Christ existed in two persons. They consecrated leavened bread and used the 'Chaldean' (Syriac) language". Until the second half of the 19th century. the term "Chaldean" continued in general use for East Syriac Christians, whether "Nestorian" or Catholic: it was the West Syriacs who were reported as claiming descent from Asshur, the second son of Shem.