King Charles III used his annual Christmas message Wednesday to hail the selflessness of those who have cared for him and the Princess of Wales this year, after both were diagnosed with cancer. The 76-year-old monarch said he and his family are “continually” impressed by those who dedicate their lives to helping others.

King Charles, Queen Camilla and other members of the royal family participated in the Christmas walk to St. Mary Magdalene Church at Sandringham in Norfolk.

King Charles has used his annual TV message to give personal thanks to the medical staff who have cared for him this year. Charles announced his cancer diagnosis in February, the same time as his daughter-in-law Kate shared she was having abdominal surgery.