The official visit marks the first substantial overseas trip for the couple since the monarch was diagnosed with cancer.

On Sunday, Oct. 20, King Charles and his wife Queen Camilla attended religious services at St. Thomas's Anglican Church in Sydney, Australia. During the visit, as the Daily Mail notes, the monarch signed the country's first official Bible and the book of common prayer.

King Charles III is only the second reigning British monarch to visit Australia. His mother, Queen Elizabeth II, became the first 70 years ago.