King Charles has postponed all of his public-facing duties while he is being treated for cancer, a statement from Buckingham Palace has said.
The King will continue his role as head of state, including paperwork and private meetings, while Prince William is expected to cover some engagements on the King's behalf.
It's understood that His Majesty will continue his weekly meetings with the Prime Minister in person, until he is advised by doctors not to.
The full statement from the Palace read: "During The King’s recent hospital procedure for benign prostate enlargement, a separate issue of concern was noted. Subsequent diagnostic tests have identified a form of cancer.
"His Majesty has today commenced a schedule of regular treatments, during which time he has been advised by doctors to postpone public-facing duties. Throughout this period, His Majesty will continue to undertake State business and official paperwork as usual.
"The King is grateful to his medical team for their swift intervention, which was made possible thanks to his recent hospital procedure. He remains wholly positive about his treatment and looks forward to returning to full public duty as soon as possible.
"His Majesty has chosen to share his diagnosis to prevent speculation and in the hope it may assist public understanding for all those around the world who are affected by cancer."