Jewish polygamy clashed with Roman monogamy at the time of the early church:
"When the Christian Church came into being, polygamy was still practiced by the Jews. It is true that we find no references to it in the New Testament; and from this some have inferred that it must have fallen into disuse, and that at the time of our Lord the Jewish people had become monogamous. But the conclusion appears to be unwarranted. Josephus in two places speaks of polygamy as a recognized institution: and Justin Martyr makes it a matter of reproach to Trypho that the Jewish teachers permitted a man to have several wives. Indeed when in 212 A.D. the lex Antoniana de civitate gave the rights of Roman Citizenship to great numbers of Jews, it was found necessary to tolerate polygamy among them, even though it was against Roman law for a citizen to have more than one wife. In 285 A.D. a constitution of Diocletian and Maximian interdicted polygamy to all subjects of the empire without exception. But with the Jews, at least, the enactment failed of its effect; and in 393 A.D. a special law was issued by Theodosius to compel the Jews to relinquish this national custom. Even so they were not induced to conform.":560
Tertullian, who lived at the turn of the 2nd and 3rd centuries, wrote that marriage is lawful, but polygamy is not:
"We do not indeed forbid the union of man and woman, blest by God as the seminary of the human race, and devised for the replenishment of the earth and the furnishing of the world and therefore permitted, yet singly. For Adam was the one husband of Eve, and Eve his one wife, one woman, one rib." 
The 3rd century Eusebius of Caesarea wrote the lost work "On the Numerous Progeny of the Ancients". Eusebius references this twice, in the Præparatio Evangelica, and in the Demonstratio Evangelica. Although his work has been given as an example of plural marriage being reconciled with the ascetic life, the problem dealt with was the contrast presented by the desire of the Patriarchs for numerous offspring and the honour in which continence was held by Christians.
Book 1, Chapter II. ----Marriage Lawful, But Not Polygamy.
Basil of Caesarea wrote in the 4th century of plural marriage that "such a state is no longer called marriage but polygamy or, indeed, a moderate fornication." He ordered that those who are engaged in it should be excommunicated for up to five years, and "only after they have shown some fruitful repentance" were they to be allowed back into the church. Moreover, he stated that the teachings against plural marriage are "accepted as our usual practice, not from the canons but in conformity with our predecessors." Augustine wrote in the second half of the 4th century that
"That the good purpose of marriage, however, is better promoted by one husband with one wife, than by a husband with several wives, is shown plainly enough by the very first union of a married pair, which was made by the Divine Being Himself."
and "The Sacrament of marriage of our time has been so reduced to one man and one wife, as that it is not lawful to ordain any as a steward of the Church, save the husband of one wife."
Socrates of Constantinople wrote in the 5th century that the Roman Emperor Valentinian I took two wives and authorized his subjects to take two wives, supporting that Christians were then practicing plural marriage.:398 There is no trace of such an edict in any of the extant Roman Laws. Valentinian I divorced his first wife according to John Malalas, the Chronicon Paschale and John of Nikiu, before marrying his mistress, which was viewed as bigamy by Socrates, since the Church did not accept divorce.
Justin Martyr, Irenaeus and Tertullian all spoke against polygamy, condemning it. Tertullian explicitly tackled the objection that polygamy was allowed for the patriarchs. He wrote, "each pronouncement and arrangement is (the act) of one and the same God; who did then indeed, in the beginning, send forth a sowing of the race by an indulgent laxity granted to the reins of connubial alliances, until the world should be replenished, until the material of the new discipline should attain to forwardness: now, however, at the extreme boundaries of the times, has checked (the command) which He had sent out, and recalled the indulgence which He had granted". (De Monogamia chapt. VI.) According to chapter XVI of De Monogamia, Hermogenes thought it was allowed for a man to take several wives. Tertullian also made a direct attack on the polygamous practice of some cults in his work Adversus Hermogenem. This is the same Hermogenes mentioned above. Tertullian writes that he was a sect leader, who mixed Stoic, Gnostic and Christian views to create a new religion.