During the Synod of Milan in 389, Augustine wrote "On the Good of Marriage" in opposition to Jovinian, who opposed Christian asceticism despite his status as a monk.
Augustine's "On the Good of Marriage" was written against somewhat that still remained of the heresy of Jovinian. Jovinian (Latin: Jovinianus; 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. Jovinian was a monk at one time in his life, but subsequently turned against monastic asceticism--though without giving up his status as monk. 
