This panel depicts the moment when St James the Greater converts Hermogenes to Christianity. On the left we observe a second scene, in which the saint throws the books the magician has rejected into the sea. These episodes are taken from the Liber Sancti Iacobi, written in the mid-XIIth century, which shortly afterwards would engender the Codex Calixtinus. The work, together with a further two paintings preserved at the Museo del Prado (The Embarkation of James the Greater's Body at Jaffa and The Translation of the Body of Saint James the Greater at the Palace of Queen Lupa), belonged to a retable dedicated to the apostle attributed to Martín Bernat, a painter from Aragon who collaborated with Bartolomé Bermejo.