Charles sued Mail on Sunday:
The Prince of Wales has launched legal action against the Mail on Sunday after it published an extract from his private journals in which he called Chinese leaders "appalling old waxworks".
Prince Charles claims the paper breached his copyright and confidentiality when it used last week's state visit by the Chinese president, Hu Jintao, as a pretext to publish a diary entry containing his thoughts on the handover of Hong Kong to the Chinese in 1997.
Entitled "The Handover of Hong Kong or the Great Chinese Takeaway", it derided the "awful Soviet-style display" of goose-stepping Chinese soldiers during the handover ceremony.
A statement from Clarence House said the prince had made the decision to take legal action "reluctantly".
"The Prince of Wales's office has been advised by lawyers that the Mail on Sunday has breached both the Prince of Wales's copyright and confidentiality," the statement said.
Sir Michael Peat, the prince's private secretary, said the decision was "a matter of principle".
"Like anybody else, the Prince of Wales is entitled to write a private journal without extracts being published. This journal was copied and passed to the Mail on Sunday without permission.
We have made this clear to the Mail on Sunday on five occasions, both orally and in writing. Nevertheless, the Mail on Sunday proceeded to publish these extracts despite the knowledge that it was a breach of the Prince of Wales's copyright and confidence."
The Mail on Sunday said it was "surprised" by the prince's decision and disputed that the journal was a private document.
"The Mail on Sunday has not at any point accepted that last Sunday's story about the Prince's account of the handover of Hong Kong involved any breach of copyright or confidentiality," a spokesman for the paper said.
"This was not a private journal. It was widely distributed and viewed, as Clarence House confirmed to us, as a historic document intended for eventual publication.
The story raised important questions about Britain's relations with China and the prince's influence on British political thinking. We believe the public has a right to know the considered views of the heir to the throne on the matters of great public interest.
"The reporting of leaked documents is a classic journalistic enterprise. We are very surprised at the action taken by Clarence House which, if pursued, raises serious issues about the freedom of the press."