What is "jovinian"

Jovinian (; died c. 405), was an opponent of Christian asceticism in the 4th century and was condemned as a heretic at synods convened in Rome under Pope Siricius and in Milan by St Ambrose in 393. Our information about him is derived principally from the work of St. Jerome in two books, Adversus Jovinianum. Jerome referred to him as the " Epicurus of Christianity". He was a native of Corduene. John Henry Newman called Aerius of Sebaste, Jovinian and Vigilantius the forerunners of Protestantism, likening them to the " Luther, Calvin, and Zwingli of the fourth century".