Gustav Adolf (1633-1695), Duke of Mecklenburg-Güstrow. Magdalena Sibylla (1631-1719), of Holstein * David Klöcker Ehrenstråhl (1629-1698)

The picture has something of this: people, woman, saint, portrait, god, Renaissance, two, Mary, royalty, veil, prayer, aura, spirituality, baroque, cross.
Perhaps it’s a painting of a man and a woman sitting next to each other in front of a red curtain, with a red drape in the background.