During his three-day historic visit, which is part of a broader Caribbean tour, the 70-year old Prince of Wales is set to dine with Cuban President Miguel Diaz-Canel, tour Havana's restored colonial district, visit community and green energy projects.
To mark his birthday, Prince Charles will attend a special tea party heralding 70 inspirational people who also turned 70 this year, before heading to a private function for friends and family hosted by the queen.
The 92-year-old Queen joined her son and heir to the throne Charles, grandsons William and Harry and their wives Kate and Meghan at the Royal Albert Hall in central London at an event organised to pay tribute to all those who have died.
Before all of the drama that characterized Prince Charles and Princess Diana's relationship — the estrangement, divorce and her tragic death 20 years ago this month — there was the fairytale wedding. The lavish ceremony in London's St Paul's Cathedral was watched by hundreds of millions of people around the world.
The letters touch upon some of the most widely speculated aspects of Late Princess Diana's life including her tumultuous marriage, her doubts and an indirect mention of Camilla, now married to Prince Charles.