Tintswalo Ngobeni, 22, has shunned the advances of King Mswati III and fled to Britain, the Daily Star reported.
She was just 15 when she caught the eye of the chubby king, who is 45 years old.
The royal, who is famous for his lavish lifestyle, is allowed to choose a new bride every year. But Ngobeni went to live with her mother in Birmingham.
She said that he started calling her at boarding school, and would ask her if she wanted to be a part of the royal family.
His wives are kept in their palace, surrounded by bodyguards, and they can’t really go anywhere unless the king says so.
Since nobody has ever turned down the king or dares to disobey him, she just disappeared.
She is now campaigning against the oppressive Swazi regime.
But she fears for her life after her first plea for political asylum in Britain was denied in 2011.
Last month, she was taken to an immigration detention.
However, after pressure from the TUC and Roger Godsiff, Labour MP for Birmingham, she was released and granted an appeal by the Home Office.