In Ep. ccxlii. written in 376, St. Basil says:  “This is the thirteenth year since the outbreak of the war of heretics against us.”  363 is the date of the Acacian Council of Antioch; 364 of the accession of Valens and Valentian, of the Semi-Arian Synod of Lampsacus, and of St. Basil’s ordination to the priesthood and book against Eunomius.  On the propagation by scission and innumerable subdivisions of Arianism Cannon Bright writes: The extraordinary versatility, the argumentative subtlety, and the too frequent profanity of Arianism are matters of which a few lines can give no idea.  But it is necessary, in even the briefest notice of this long-lived heresy, to remark on the contrast between its changeable inventiveness and the simple steadfastness of Catholic doctrine.  On the one side, some twenty different creeds (of which several, however, were rather negatively than positively heterodox) and three main sects, the Semi-Arians, with their formula of Homoiousion, i.e. the Son is like in essence to the Father; the Acacians, vaguely calling Him like (Homoion); the Aetians, boldly calling Him unlike, as much as to say He is in no sense Divine.  On the other side, the Church with the Nicene Creed, confessing Him as Homoousion, ‘of one essence with the Father,’ meaning thereby, as her great champion repeatedly bore witness, to secure belief in the reality of the Divine Sonship, and therefore in the real Deity, as distinguished from the titular deity which was so freely conceded to Him by the Arians.”  Cannon Bright, St. Leo on the Incarnation, p. 140 Socrates (ii. 41), pausing at 360, enumerates, after Nicæa: 1.  1st of Antioch (omitted the ὁμοούσιον, a.d. 341). 2.  2d of Antioch (omitted the ὁμοούσιον, a.d. 341). 3.  The Creed brought to Constans in Gaul by Narcissus and other Arians in 342. 4.  The Creed “sent by Eudoxius of Germanicia into Italy,” i.e. the “Macrostich,” or “Lengthy Creed,” rejected at Milan in 346. 5.  The 1st Creed of Sirmium; i.e. the Macrostich with 26 additional clauses, 351. 6.  The 2d Sirmian Creed.  The “manifesto;” called by Athanasius (De Synod. 28) “the blasphemy,” 357. 7.  The 3d Sirmian, or “dated Creed,” in the consulship of Flavius Eusebius and Hypatius, May 22d, 359. 8.  The Acacian Creed of Seleucia, 359. 9.  The Creed of Ariminum adopted at Constantinople, as revised at Nike.