The Wedding of Alexander the Great (356-323 BC) and Roxana Pierre-Narcisse Guerin (1774-1833)

The picture has something of this: people, Renaissance, group, baby, woman, Mary, saint, wear, man, royalty, dress, kneeling, son, cape.
Perhaps it’s a painting of a group of people standing in front of a man in a red dress and a woman in a white.