J. H. Kurtz, Church History, Volume 1 (of 3…
“ A decretal of the Roman bishop, Siricius, in A.D. 385, with semi-Manichæan abuse of marriage, insisted on the celibacy of all bishops, presbyters and deacons, and Leo the Great included even subdeacons under this obligation. All the more distinguished Latin church teachers contended zealously for the universal application of the injunction of clerical celibacy. Yet there were numerous instances of the contravention of the order in Italy, in Gaul, and in Spain itself, and conformity could not be secured even by the most emphatic re-issue of the injunction by successive Synods. ”
