Favourite, one of King Karl XI’s riding horses David Klöcker Ehrenstråhl (1629-1698)

The picture has something of this: cavalry, horse, seated, mammal, mare, equestrian, mustang, people, equine, racehorse, two, stallion, motion, farm, stable, livestock.
Perhaps it’s a painting of a black horse standing on its hind legs in front of a columned building with a sky in the background and a stone column in the foreground.