London, Feb. 6 -- Britain's King Charles III has been diagnosed with cancer and has started receiving treatment, Buckingham Palace announced on Monday.

The diagnosis came shortly after the 75-year-old monarch was treated for an enlarged prostate.

"His Majesty has been treated for benign prostate enlargement. It was during this intervention that the separate issue of concern was noted and subsequently diagnosed as a form of cancer," a Palace spokesperson said.

A statement from Buckingham Palace said the King has "today commenced a schedule of regular treatments, during which time he has been advised by doctors to postpone public-facing duties."

According to the statement, throughout the period, the King will continue to "undertake St...