North Korean leader Kim Jong-un was named marshal of the army, the country's top military rank. Like another national leader, his birth is in dispute.

Like another national leader, his birth is in dispute.

The new title completes Kim Jong-un's elevation following the death of his father Kim Jong-il in December. He already heads the Workers' Party of Korea and is First Chairman of the National Defence Commission.

Kim -- believed to be in his late 20s -- has steadily worked to impose his own stamp on the top leadership of North Korea, and on Sunday ousted Vice Marshal Ri Yong-ho, the country's leading military figure, who was seen as close to Kim Jong-il.