The ban on former boxer Mike Tyson from entering the UK is "mandatory" because of the length of his jail sentence for rape.
Under tougher immigration rules introduced in December 2012, there is "a mandatory refusal where a person has been convicted of an offence and sentenced to at least four years' imprisonment, at any point in the past."
Although Tyson only served three years in prison for the crime, he was sentenced to six years.
Former world heavyweight boxing champion and convicted rapist Mike Tyson has discovered he is banned from entering the UK.
The 47-year-old has cancelled a string of appearances in London as part of a promotional tour for his new book after finding out he was banned from Britain.
His publishers said recent changes to UK immigration rules, including any person sentenced to more than four years in prison being banned from Britain, meant he was unable to travel.
Tweets posted on Tyson's official Twitter account as recently as Friday suggest the boxer was unaware he would be hit by the changes. He wrote: "So, UK fans, who is brave enough to get in the ring and ask me a question?"
Tyson will now promote his autobiography Undisputed Truth in Paris.