King Charles III will receive Sultan Haitham bin Tarik Al Said of Oman for a state visit hosted at Windsor Castle. The occasion stands out for its rarity, since the last comparable visit came 44 years ago. State visits are the most formal engagements on the royal calendar, usually built around a ceremonial welcome and working talks. The choice of Windsor follows recent practice, as the castle has increasingly taken over hosting duties from Buckingham Palace. British and Omani relations run deep, built on trade and defence cooperation over generations. The brief announcement did not spell out the programme or the exact dates of the stay. A gap of more than four decades between visits is long by any measure, and the reunion at Windsor will draw attention in both capitals.