Britain's King Charles III and Queen Camilla arrive to attend the Christmas day service at St Mary Magdalene Church in Sandringham in Norfolk, England on Dec. 25, 2023. The king's cancer diagnosis heaps more pressure on the British monarchy, which is still evolving after the 70-year reign of the late Queen Elizabeth II. When he succeeded his mother 18 months ago, Charles' task was to demonstrate that the 1,000-year-old institution remains relevant in a modern nation whose citizens come from all corners of the globe. Now the king, who turned 75 in November, will have to lead that effort while undergoing treatment for cancer. (AP Photo/Kin Cheung, File)
