Prince Albert of Monaco has sent a heartfelt message of congratulations to King Charles III on his accession to the British throne.

The letter, shared on the Palais Princier de Monaco Instagram, came after the royal had paid tribute to ‘inspiring’ Queen Elizabeth II following her death on September 8.

Prince Albert, who has met both King Charles and the late Queen on numerous occasions, offered his ‘warmest congratulations’ to the new king on his accession.

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Prince Albert of Monaco has sent a heartfelt message of congratulations to King Charles III on his accession to the throne. The royals are pictured together at Oslo Cathedral in 2001

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Prince Albert writing in a Church’s guestbook next to a portrait of the Queen during a memorial

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The letter, shared on the Palais Princier de Monaco Instagram , came after the royal had paid tribute to ‘inspiring’ Queen Elizabeth II following her death on September 8

He said: ‘The Princess and I wish you every success in leading the people of the United Kingdom and the many great nations of the Commonwealth. I am confident that under your reign, peace and stability will continue to prosper.

‘I look forward to seeing the important work you have achieved throughout your life further flourish in the years to come.

‘Notably, the great weight you place on sustainability, the fight against climate change and ocean conservation issues that I know we both feel are paramount for the future of our planet.

‘On behalf of the citizens of the Principality of Monaco, it is my honour to share our best wishes of good health and prosperity.’

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Prince Albert, who has met both King Charles and the late Queen on numerous occasions, offered his ‘warmest congratulations’ to the new king on his accession

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Princess Charlene (left) paid tribute to a ‘great lady’ as she sent her condolences to the British Royal Family

Earlier, Prince Albert and his wife Princess Charlene attended a church service in memory of the late Queen at St Paul’s Anglican Church in Monaco.

The pair also sent a heartfelt tribute to the ‘great’ British monarch last weekend.

Charlene, 44, said she was ‘deeply saddened’ by the news of the Queen’s passing.

She added: ‘I am deeply saddened at the news of the death of Her Majesty Queen Elizabeth II, a truly great lady whose dedication and service was recognised throughout the world during the 70 years of her reign.

‘Today, my thoughts are with her family, her children, her grandchildren, her great-grandchildren and the British people.’

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 The Prince and Princess of Monaco appeared deep in thoughts as they attended a religious service for the Queen at St Paul’s Anglican Church in Monaco last week

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Princess Charlene used her Instagram account to send her condolences to the British Royal Family and British people

Prince Albert also posted a tribute to the Queen on Instagram, praising her ‘inspiring’ reign.

He wrote: ‘Her Majesty’s unwavering dedication and commitment to her duty during Her reign has always been extremely inspiring; It will long be remembered and admired.

‘She truly represented the unity and dignity of the United Kingdom throughout the last seven decades.’

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Prince Albert and Princess Charlene are pictured during a memorial service for Queen Elizabeth

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Sweden’s Crown Princess Victoria sits next to King Charles III and Crown Prince Albert of Monaco in may 2004

Queen Elizabeth II passed away peacefully at Balmoral on Thursday, September 8 at the age of 96.

Following her death King Felipe VI and Queen Letizia of Spain paid tribute to their distant relative with a heartfelt statement.

The Spanish Royal Family echoed sentiments from the Dutch and Swedish royals in praising the Queen’s sense of duty to her country throughout her historic 70-year reign.

Posting a letter to King Charles III on the Casa Real Twitter account, King Felipe said he would ‘dearly’ miss his Aunt Lilibet, a figure he held close.

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King Charles III and Queen Consort Camilla meet Prince Albert at Clarence House in 2006