PALLADIO, heretical bishop of RATIARIA. - Elected bishop, he initially belonged to the Photinians and was therefore deposed at the Council of Sirmium in 351.
He regained his see by embracing Arianism and remained until the end one of the principal supporters of the Homoean party in Illyricum. At the time of the Nicene restoration, he at first succeeded in avoiding condemnation by failing to appear at the Council of Sirmium (July 378) and invoking the convocation of a general council, at which he hoped to justify himself. He was instead obliged to attend the Council of Aquileia (5 Sept. 381), at which s. Ambrogio, reading to him the letter of Arius to Alexander, asked whether or not he condemned II. He attempted to evade an answer by appealing to a general council, but was convicted of heresy, excommunicated, and deposed.
He wrote a treatise, now lost, against the De fide of s. Ambrogio. It also appears that the palimpsest fragments of certain polemical treatises published by A. Mai in the Scriptorum veterum nova collectio, III, Rome, part 2, pp. 208–39, should be attributed to P.