LONDON, April 11 -- An African AIDS charity co-founded by Britain's Prince Harry said on Friday it had launched legal proceedings against him for "reputational harm", as the royal "categorically" rejected the defamation claims.

Harry helped found the Sentebale charity in 2006 in honour of his late mother, Princess Diana. 

But he quit the institution last year amid a bitter governance dispute with its chairperson.

King Charles III's younger son and Mark Dyer, who was also previously a Sentebale trustee, are both named as defendants in the case at London's High Court, according to court filings.

"As Sentebale's co-founder and a founding trustee, they categorically reject these offensive and damaging claims," a spokesperson for the ...