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 and Queen Camilla spent Sunday, Oct. 20, greeting members of the public at a church for the first time since they landed in Australia two days prior for their royal tour of Sydney and Samoa.