EUSEBIUS, bishop of Samosata, saint. — He took part in the election of Meletius to the see of Antioch. At the Synod of Antioch in 363, presided over by the latter, he adhered to the Nicene Council and became, together with Basil of Caesarea—of whom he was an advisor and friend—one of its most intrepid defenders against the Arian emperor Valens.
EUSEBIUS of Vercelli, saint. — *Codex Evangeliorum* (cod. a), probably an autograph of St. Eusebius. 1st and 2nd columns: lines 14, 2–8; 3rd and 4th columns: lines 13, 21 ff. — Vercelli, chapter archive of the Cathedral.
He suffered martyrdom in 361. He died between 370 and 371. The Church numbers him among its martyrs (Dec. 16).
Of his writings, three letters remain: 1) *To Constantine Augustus*, in which he replies to the Emperor who had invited him to attend the Council; 2) *To the Priests and People of Italy*, sent from his Palestinian exile to the Church of Vercelli. In it there is an *Exemplar libelli fidei* addressed to the *Patriarchs with their followers*, in which he defends himself against the accusations made by the Arian bishop Patrophilus; 3) *To Gregory, Bishop of Spalatum*, written from Egypt to Gregory of Elvira.
St. Jerome, who includes him among the illustrious men (*De vir. ill.*, 96), attributes to him the Latin translation of the *Commentaries on the Psalms* by Eusebius of Caesarea (v.).
Among works of doubtful authenticity are: 1) the *Athanasian Symbol*, the *Quicumque* and seven of the twelve pseudo-Athanasian books *De Trinitate*, which Burn considers authentic while denying the *Symbolum*; 2) *De Sancta Trinitate confessio*; 3) *Expositio s. Ambrosii episcopi ad neophytos de Symbolo*, attributed by some to Lucifer of Cagliari and by others (Brewer) to Rufinus. It remains uncertain whether he wrote the Gospel Codex preserved in the cathedral of Vercelli, which is one of the most important biblical documents before St. Jerome.