Prince Al Muhtadee of Brunei and Pengiran Anak Sarah (AP Photo/Andy Wong, File)

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To give him his full title, HRH Crown Prince General Dr Haji Al-Muhtadee Billah Bolkiah GCVO is heir to the Sultan of Brunei. In an extravagant ceremony on 9 September 2004 the Prince married 17-year old Pengiran Anak Sarah. The ceremony, estimated to cost nearly £3 million, took place at the Nurul Iman Palace in Bandar Seri Begawan. The bride is the daughter of Pengiran Salleh Ab Rahaman, a distant relative of the royal family. The couple's first child, Prince 'Abdul Muntaqim, was born on 17 March 2007 and their second Princess Muneerah Madhul was born on 2 January 2011.