Allegorical representation: Neptune blessed by Faith

Neptune, with a trident in his hand and his foot on a dolphin, looks at the personification of Faith. She has a cross as a staff in her hand and a halo around her head, and points to Neptune's head. She has her foot on a helmet (of Minerva?) and behind her, armor with the head of Medusa. In the background, a mountain landscape with a city on a river.