Prince Olaf of Norway

Prince Olaf of Norway is the prince of Norway.

History
Prince Olaf of Norway was on the cover of the issue of Barely Regal Magazine that Marge was reading.

Behind the Laughter
Currently there is no Price Olaf of Norway, however there have been six kings of Norway named Olaf, the latest of which, who the show may be referring to, spelled his name as "Olav". was prince from his birth in 1903, and became king in 1957, a role he held till his death in 1991.