This tract appeared about a.d. 383. The question which gave occasion to it was whether the Mother of our Lord remained a Virgin after His birth. Helvidius maintained that the mention in the Gospels of the "sisters" and "brethren" of our Lord was proof that the Blessed Virgin had subsequent issue, and he supported his opinion by the writings of Tertullian and Victorinus. The outcome of his views was that virginity was ranked below matrimony. Jerome vigorously takes the other side, and tries to prove that the "sisters" and "brethren" spoken of, were either children of Joseph by a former marriage, or first cousins, children of the sister of the Virgin. A detailed account of the controversy will be found in Farrar's "Early Days of Christianity," pp. 124 sq. When Jerome wrote this treatise both he and Helvidius were at Rome, and Damasus was Pope. The only contemporary notice preserved of Helvidius is that by Jerome in the following pages.http://www.newadvent.org/fathers/3007.htm
There are no known surviving works of Helvidius. It is hard to accept only a one sided argument as absolute truth.
Peak Paganism Period - almost 300 years after the Apostles!