Giacopo Antonio Venier
- Not to be confused with Antonio Venier (d. 1400), Doge of Venice.
On September 15, 1460, Alfonso V of Aragon named him Bishop of Siracusa. Pope Pius II confirmed this appointment on January 9, 1462. On September 16, 1464, he was transferred to the see of León, with Venier taking possession of the bishopric on October 7. He was consecrated as a bishop on December 22, 1465 in the church of Sant'Apollinare alle Terme Neroniane-Alessandrine in Rome by Cardinal Guillaume d'Estouteville, Archbishop of Rouen.
In the consistory of May 7, 1473, Pope Sixtus IV made Venier a cardinal priest. On May 10, 1473, he received the red hat in the Basilica di Santa Maria Maggiore; and on May 17, he received the titulus of Santi Vito, Modesto e Crescenzia (a deaconry raised pro illa vice to titulus). He opted for the titular church of the Basilica di San Clemente on December 3, 1476.