Prince Ademola Babatunde Bakare alleges that his treatment as an asylum-seeker in the UK is worse than his experience in Nigeria, where he was beaten and shot.
In letters to the UK authorities, he argues he would be better looked after in Nigeria and says: "I didn't want to come to this useless country in the first place."
The 37-year-old came to Britain in 2008 after mistakenly boarding a ship he thought was bound for Canada, where he had arranged to join his wife and children.
But when he reported himself to the UK authorities he was arrested and sentenced to prison for travelling with false documents.
He said that he did not receive proper medical treatment for his gunshot wounds during his year-long detention.
He has now written to the Home Office asking to be returned home. In another letter, seen by the Independent, he complains: "The Home Office is using my illness to torture me. I am a torture survivor and am still suffering seriously from my past torture, which I needed proper standard medical care."
Prince Bakare is a member of the Ajike royal family, one of three competing royal families in the city of Owo.
His family were targeted with violence after challenging the legitimacy of the new king of Owo.
He claims that in 2004 his wife was raped and stabbed in the back, his three-year-old son burned with boiling water and his house set on fire.
He then fled to Benin but was found, shot in the legs and had his ribs broken. He then fled Africa and arrived in Britain in March 2008 where he was arrested for using forged documents. He spent six months in prison before being transferred to Brook House immigration removal centre, in Sussex.
Matthew Coats, head of Immigration, said: "The UK Border Agency will not tolerate abuse of our asylum and immigration systems and we will return those here illegally. We consider every individual case with enormous care and where someone needs our protection, we will grant it and do so proudly.
"It is however reasonable to expect people who have been found by the independent courts not to need asylum to return home."
Prince Bakare has reportedly now been served with travel documents for a return flight to Nigeria.