Guardian Editor in chief Alan Rusbridger today praised reporter Rob Evans for his 10-year campaign to allow the letters to be published.
Evans originally made an application under the Freedom of Information act to see the Prince's 2004 and 2005 letters to Government ministers.
When he was refused, he went to an Freedom of Information Tribunal who ruled they could be published in 2012.
But the Attorney General made a ruling preventing the publication of the letters by the Guardian.
Reacting to the Supreme Court's decision on the letters, Clarence House said it was "disappointed the principle of privacy had not been upheld".
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 Supreme Court is set to rule whether letters written by the Prince of Wales to Government ministers should be made public.Read the full story ›
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Benedict Cumberbatch is to read a specially written poem at the re-burial of Richard III, who scientists say is a distant relative of the actor.
The Imitation Game star, who is due to star in a forthcoming BBC television series about the monarch, will read the poem at a Leicester Cathedral service later today.
Richard III's coffin, containing his mortal remains, will be lowered into a specially made tomb of Swaledale stone inside Leicester Cathedral.
It is reported the Queen has also written a tribute in the order of service acknowledging the king's role in British history.
The Bishop of Leicester said today's service would be "solemn, but hopeful" and mark the "extraordinary moment" in English history brought about by Richard's death on August 22, 1485.
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Muhammad Ali welcomed the Prince of Wales and Duchess of Cornwall to his home city of Louisville, describing Charles as "the greatest".
The sport star's words came in a letter rather than in person as he was not well enough to join leading figures from the city at a cultural greeting for the royal couple, who were in the city on the final day of their US tour.
Instead, Louisville's Mayor Greg Fischer welcomed the royal couple by reading them Ali's letter:
(My wife) Lonnie and I welcome you to our hometown of Louisville, Kentucky, USA. We are honoured that you have come to explore, share and learn about new sustainable initiatives that are so close to your heart.
Louisville prides itself on being a compassionate city and we are confident that you will leave feeling a sense of our southern hospitality, caring for the environment, and yes - our love for college basketball.
As you travel back to your homeland, we hope you know how much this city respects and admires the many contributions you have made in the world.
We think you are the greatest.
The Duchess of Cornwall has paid a visit to the home of the world famous Kentucky Derby where she met two unlikely entrants.
As part of her trip to Lousiville, Camilla was at the Churchill Downs racecourse to celebrate the work of the Brooke, a worldwide equine welfare charity of which she is president.
Whilst there she met a pair of donkeys and gave them treats after "giving them a good scratch".
The visit came on the final day of Prince Charles and Camilla's four day trip to the US.
Prince Charles has said there is "awful lot to worry about" in relation to the world's environmental resources and wildlife.
He said his conservation efforts were driven by a need to leave future generations a world "which isn't even more destroyed and damaged and dysfunctional than it need be".
He listed his areas of concern from the continuing destruction of rainforests, to the threat to endangered animals like rhinos, elephants and tigers and the need for sustainable cities.
Charles said: "The world has looked to the United States for leadership in so many challenging circumstances in the past.
"However, today we are faced by truly exceptional challenges and threats - a veritable 'perfect storm' which, if not met by strong, decisive and far-sighted leadership, could overwhelm our capacity to rectify the damage and thereby destroy our grandchildren's future inheritance."
His comments came after he was presented with the exceptional leadership in conservation honour, from the International Conservation Caucus Foundation during a ceremony in Washington.