King Charles greeted the public after Easter church service at Windsor on Sunday, marking his first major public appearance since being diagnosed with cancer on Feb. 5.

The King and his wife, Queen Camilla, waved to a crowd of onlookers outside the chapel, and chatted with the visitors after the service. They were joined by the Duke and Duchess of Edinburgh—Prince Edward and Sophie—and their son, James, Earl of Wessex, along with the King’s sister, Princess Anne, who was joined by her husband, Sir Timothy Laurence. Prince Andrew and Sarah Ferguson, Duchess of York, were also in attendance.

King Charles was diagnosed with an undisclosed type of cancer during a recent treatment for an enlarged prostate. He has continued to carry out many of his royal commitments in private, though he has limited public-facing duties at the advice of his doctors.

Just a few days ago, the King apologized for missing the traditional Maundy Thursday service in a recorded audio message that was played at the service at Worcester Cathedral. Queen Camilla, who attended the service alone, has largely been solely carrying out public engagements that might otherwise fall on her husband.

The Easter service was a smaller affair than usual this year. Absent from the celebration were the Prince and Princess of Wales and their three children. Catherine, the Princess of Wales, has been absent from public royal engagements since Christmas, after undergoing a planned abdominal surgery in January. On March 22, the palace announced that Catherine is recovering and is undergoing “rest.”

In January, when it was first announced by Kensington Palace that Kate would be stepping back from royal duties after Easter, she was expected to return to royal duties after Easter, though her return has been postponed until she is given clearance by her doctors.