King Charles III was diagnosed with cancer this year after treating an enlarged prostate. His daughter-in-law, Kate Middleton, completed chemotherapy in September.

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.

The British monarch recorded his annual holiday address from the chapel of a former hospital, rather than from a palace.

King Charles III has used his Christmas message to hail the efforts of healthcare workers and all those who support others, before praising the medical staff who provided “strength, care and comfort” during his and the Princess of Wales’ cancer treatments.

After a year that saw both King Charles and Kate Middleton diagnosed with cancer, “Obviously it made sense it had some form of health connection," a source said

King Charles has strayed from royal tradition with his year’s Christmas speech. The monarch, 76, who opted to break tradition last year by writing the speech himself, has prerecorded his festive broadcast in a different location to that of previous years.

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.

Britain’s King Charles thanked medical workers who treated him and Princess Kate after their cancer diagnoses in his annual Christmas message on Dec. 25.

His Christmas Day message follows a year that saw him and the Princess of Wales treated for cancer.