 Complete the following phrase:  Mutassim Billah Gaddafi , also transliterated as Al-Moatassem Bellah Al-Qaddafi or Al-Mutasim Billah al-Qadhafi; 18 December 1974  20 October 2011 was a Libyan Army officer, and the National Security Advisor of Libya from 2008 until 2011. He was the fourth son of former Libyan leader Muammar Gaddafi, and a member of his fathers inner circle. His mother was Safia Farkash, who had some Bosnian ancestry. He was captured during the 