Britain's King Charles III will attend a church service on Easter, Buckingham Palace announced.
It is the monarch's most significant engagement since he was diagnosed with cancer.
Charles and his wife, Queen Camilla, will attend the Easter service at St. George's Chapel in Windsor Castle, a long-standing annual tradition of the British royal family, the BBC reported.
The announcement comes after the royal's daughter-in-law Catherine, Princess of Wales, announced last week that she is also being treated for cancer.
This puts the monarchy in an unprecedented crisis in modern times, with two of its most senior members battling serious illnesses at the same time.
Catherine, 42, is married to Charles' eldest son and heir, Prince William, making her a future queen.
Charles had only ruled for 17 months when the palace announced in early February that he had cancer and would suspend all public engagements as he began treatment.
In January, he was admitted for surgery on a benign prostate disease, but was subsequently diagnosed with cancer.
Charles continues to work behind the scenes, holding some private meetings and increasingly attending official events.
He was recently photographed receiving representatives of religious communities at Buckingham Palace in central London.
Last week, pictures showed him meeting diplomats at the palace, as well as Korean War veterans, on two separate engagements.
In a statement earlier this month, Charles said he would continue to serve "to the best of his ability" and that he was "deeply touched" by people's wishes for his health.
Last week, he praised Kate, as she is widely known, for her courage after she revealed in a video message that she was undergoing chemotherapy.
She was last seen at a public engagement on December 25, after which she underwent abdominal surgery in January after which cancer was discovered.
Kensington Palace's office said at the time that she was not expected to be ready to return to public duties until after Easter. /BGNES
