In August 2013 North Korea's founding principles were reportedly revised to enshrine the supremacy of the "Baekdu bloodline" to legitimise the Kim dynasty's continued inheritance of the country's leadership.Since then Kim Jong-un's sister, Kim Yo-jong, thought to be about 30, has enjoyed a spectacular rise to prominence within the ruling elite. She is said to be especially close to her brother from shared years of schooling in Switzerland in the late 1990s, and in recent years has been responsible for much of his image-making, as vice director of the party's propaganda and agitation department.
