The Supreme Court has ruled a series of letters written by the Prince of Wales to government ministers can be published.
The decision overturns an earlier ruling made by the Attorney General, which was upheld by the High Court, preventing the publication of the so-called 'Black Spider' memos.
Supreme Court President Lord Neuberger said there was a "fundamental composite principle" behind the court's reasons for dismissing the appeal.
He announced: "That principle is that a decision of a judicial body should be final and binding and should not be capable of being overturned by a member of the executive."
A Freedom of Information Tribunal had ruled in 2012 that the letters, so named after the Prince's distinctive handwriting and abundant use of underlining and exclamation marks, could be published but the Attorney General had prevented the publication.
The Prince of Wales has appeared to ignore a question on recent reported comments comparing Russian president Vladimir Putin to Adolf Hitler.
A reporter asked: "What do you make of Mr Putin's comments about you today?" A spokeswoman for the Prince of Wales declined to comment on Mr Putin's criticism.
A spokeswoman for the Prince of Wales has declined to comment on Mr Putin's criticism.
Vladimir Putin sent a direct personal message to Prince Charles when questioned today over the future King's reported comparison of him to Adolf Hitler.
The Russian President said: "Give my words to Prince Charles. He has been to our country more than once - if he made such a comparison, it is unacceptable and I am sure he understands that as a man of manners."
Mr Putin said: "It reminds me of a good proverb: 'You are angry. That means you are wrong."'
Russian president Vladimir Putin has described the Prince of Wales's reported comparison of him with Adolf Hitler as "unacceptable" and said such remarks were "not what monarchs do".
If the allegations that Prince Charles compared President Vladimir Putin to Hitler are true, they don't "reflect well" on the future King a Russian Foreign Officer spokesman has said.
"If these words were truly spoken, then without doubt, they do not reflect well on the future British monarch," Russian Foreign Ministry spokesman told a news conference
"We view the use of the Western press by members of the British royal family to spread the propaganda campaign against Russia on a pressing issue - that is, the situation in Ukraine - as unacceptable, outrageous and low." The spokesman added.
The Russian Embassy has branded reported remarks made by the Prince of Wales comparing president Vladimir Putin to Adolf Hitler as "outrageous".
A Russian Foreign Ministry spokesperson has said that, if reports that the Prince of Wales linked Russian President Vladimir Putin to Hitler are accurate, the remarks were "unacceptable, outrageous, and low."
Attempts to calm a potential diplomatic row over the Prince of Wales's comparison of Russian president Vladimir Putin to Adolf Hitler will continue today when the Foreign Office meets with the Russian deputy ambassador later today.
Russia's deputy ambassador is expected to meet a senior Foreign Office official to discuss the reported comments on the Ukraine crisis made during a private conversation with a member of the public during a royal tour of Canada.
The Prince of Wales appeared to brush off the controversy surrounding his remarks in which he reportedly compared Russian leader Vladimir Putin with Adolf Hitler, and playfully threw a paper plane at assembled media crowds in Winnipeg, Manitoba last night.
Charles appeared in good spirits when he arrived at Stevenson Hangar in Winnipeg, Manitoba, with the Duchess of Cornwall and smiled as they were greeted by dozens of local students.
Charles and Camilla were given the chance to test the flight of their own paper planes by throwing them at a target, which was positioned next to number of photographers gathered to take their picture. He appeared to celebrate with a triumphant "yes" when he hit one of the cameramen.