prinzoskarvonpreusen

en.wikipedia.org/wiki/Prince_Oskar_of_Prussia
See
and

Fascinating portrait. The jaunty informal angle of the hat is telling. One moment he seems a lovable rogue and the next moment he seems sly, teasing and perhaps sometimes a little bit nasty. (I say this entirely from the portrait. I don't know anything about him, otherwise.)

Edward Norton

I thought Edward Norton, too.

amazing portrait!

Princess Victoria Louise was the only daughter of German Emperor, William II, here is her bio en.wikipedia.org/wiki/Princess_Viktoria_Luise_of_Prussia she married Ernest Augustus, Duke of Brunswick, here is his bio: en.wikipedia.org/wiki/Ernest_Augustus,_Duke_of_Brunswick Duke of Cumberland, in previous photo, is father of the groom.

Thanks! We'll fix the source data and reload the description

That's in Karlsruhe, capital of the grand duchy of Baden, in the German Empire. It was the day of the engagement of Princess Viktoria Luise with Princ Ernst August, February 11th 1913; the third person on the photo is Prince Oskar of Prussia (1888–1958), one of Viktoria Luise's six brothers. In the background the grand duke's palace.

with more of the text on the left side: flickr.com/photos/library_of_congress/3408795857:

LGR109: thanks for identifying the location of the photograph and the building. We will add this information to the description of the image.