King Charles III will on Thursday meet Pope Leo XIV at the Vatican and make history as the first head of the Church of England to pray publicly with the pontiff for five centuries.
The 76-year-old monarch, who is supreme governor of the Church of England, arrived in Rome on Wednesday evening with his wife, Queen Camilla, for what Buckingham Palace described as a "historic" state visit.
It will be Charles's first meeting with Leo since the US-born pope took over as head of the world's 1.4 billion Catholics in May, following the death of Pope Francis.
The royals will arrive at the Apostolic Palace at 10.45am (0845 GMT) for private talks with the pope.
The king and queen will then join an ecumenical service at midday (1000 GMT) in the Sistine Chapel led by Pope Leo and the archbishop of Y