In the context of Averoldi Polyptych, explain the Saints Nazarius and Celsus with Donor of the Description.
The left panel show the saints Nazarius and Celsus, to whom the church housing the altar was dedicated, on a gloomy background. Nazarius wears shining armor,  his disciple, Celsus, behind him. The kneeling donor, Altobello Averoldi, the papal legate to Venice, is portrayed in profile, stylistically reminiscent of the depiction of Sigismondo de' Conti in Raphael's Madonna of Foligno. The influence of Giorgione, who before his death in 1510 had worked with Titian, may be discerned in the calm atmosphere and the dull colors.
Raphael Titian left papal legate Venice Nazarius and Celsus Giorgione Madonna of Foligno