Then it was off to Switzerland to attend boarding school.
Called "Pak Un" and described as the son of an employee of the North Korean embassy, Kim Jong Un is thought to have attended an English-language international school in Gümligen near Bern.
Kim Jong Un is described by former classmates as a quiet student who spent most of his time at home, but he had a sense of humor, too.
"He was funny," former classmate Marco Imhof told The Mirror. "Always good for a laugh."
"He had a sense of humor; got on well with everyone, even those pupils who came from countries that were enemies of North Korea," another former classmate told the German newspaper Welt am Sonntag. "Politics was a taboo subject at school ... we would argue about football, not politics."