It appears that the Arians did not venture to speak disrespectfully of the definition of the Council till the date (a.d. 352) of this work, when Acacius headed them. Yet the plea here used, the unscriptural character of its symbol, had been suggested to Constantius on his accession, a.d. 337, by the Arian priest, the favourite of Constantia, to whom Constantine had entrusted his will, Theod. Hist. ii. 3; and Eusebius of Cæsarea glances at it, at the time of the Council, in the letter to his Church, which is subjoined to this Treatise.