It was not Rome.. Rome did not even have a canon until Trent
From wiki:
In his Easter letter of 367, Athanasius, Bishop of Alexandria, gave a list of exactly the same books that would formally become the New Testament canon,[6] and he used the word “canonized” (kanonizomena) in regards to them.[7] The first council that accepted the present Catholic canon (the Canon of Trent) may have been the Synod of Hippo Regius in North Africa (AD 393); the acts of this council, however, are lost. A brief summary of the acts was read at and accepted by the Councils of Carthage in 397 and 419.[8] These councils were under the authority of St. Augustine, who regarded the canon as already closed.[9] Pope Damasus I’s Council of Rome in 382, if the Decretum Gelasianum is correctly associated with it, issued a biblical canon identical to that mentioned above,[6] or if not the list is at least a sixth-century compilation.[10] Likewise, Damasus’s commissioning of the Latin Vulgate edition of the Bible, circa 383, was instrumental in the fixation of the canon in the West.[11] In 405, Pope Innocent I sent a list of the sacred books to a Gallic bishop, Exsuperius of Toulouse. When these bishops and councils spoke on the matter, however, they were not defining something new, but instead “were ratifying what had already become the mind of the church.”[12] Thus, from the fifth century onward, the Western Church was unanimous concerning the New Testament canon.[13]
From me:
Most would say that it was in the fourth or fifth century that the Catholic Church came up with the New Testament Canon. You should thank us that we, under the guidance of the Holy Spirit, gave you this.