LONDON (AP) — King Charles III attended Sunday services for the first time since his cancer diagnosis, offering a cheerful wave as he walked out of the parish church that has regularly served as a place of worship for the royal family.

Charles and Queen Camilla went to St. Mary Magdalene Church, close to Sandringham House in eastern England where the king retreated to recuperate following his first treatment for an unspecified form of cancer. The estate, some 110 miles (180 kilometers) north of London, offers the monarch a place of shelter where he can isolate from the risk of infection.

The appearance came a day after he expressed thanks for the messages of support he has received from the public. In a statement issued late Saturday, the monarch said that such thoughts are “the greatest comfort and encouragement.”

“It is equally heartening to hear how sharing my own diagnosis has helped promote public understanding and shine a light on the work of all those organizations which support cancer patients and their families across the U.K. and wider world,” he said in a statement.

“My lifelong admiration for their tireless care and dedication is all the greater as a result of my own personal experience.”

Buckingham Palace announced the diagnosis on Monday. Charles was last seen on Tuesday as he left his home at Clarence House in London after starting his treatment.

Sandringham, the private home of the past six British monarchs, sits amid parkland, gardens and working farms. It has been owned by the royal family since 1862.