Karl von Habsburg-Lotharingen was the eagerest of the warring monarchs to begin peace negotiations All through the First World War. He accepted Pope Benedict XV's Seven Points for peace, while the other rulers rejected it.
Anyway, on to my point. Karl, while still archduke, was married to Zita, princess of Parma-Bourbon. The really cool thing is that we have footage of the royal wedding. So cool!
So you can pick him out in the video, here's a picture of him:
Oh, and you can also find Emperor Franz Josef: