King Charles III attended the Easter Sunday service at Windsor Castle making his first major public appearance since he was diagnosed with cancer in January.


Dressed in a dark overcoat and shiny blue tie, the king,75 smiled as he made his way along a rope outside St. George's Chapel for about five minutes, reaching to the crowd as he greeted them who waved get-well cards and took photos, reported the Associated Press. 


“You’re very brave to stand out here in the cold,” Charles told them. 


“Keep going strong,” shouted one member of the crowd as Charles and Queen Camilla walked by.  


The service was also attended by the Duke and Duchess of Edinburgh and their son, James, Princess Anne and her husband, Timothy Laurence, and the Duke and Duchess of York also. 


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Princess of Wales and her family were absent as her treatment for cancer continues which she told about in a video message earlier this month.


The Archbishop of Canterbury, in an Easter sermon, wished the king and Catherine well as he encouraged the congregation to pray for them during the treatment, reported the Guardian. 


Justin Welby also praised the royals for their dignity and their "lack of selfishness", which he said "boosted others" to do the same. 


The archbishop said: “In each of our lives, there are moments which change us for ever – sometimes it is individual. We have watched and sympathised with, and felt alongside, the dignity of the king and the Princess of Wales as they have talked of their cancer, and in doing so, by their lack of selfishness, by their grace and their faith, boosted so many others.”


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The king was diagnosed with cancer during his treatment for an enlarged prostate in January and the news was shared with the public in early February while Catherine's diagnosis was made during post-operative tests after abdominal surgery in January.


However, the type of cancer for both the king and Princess of Wales has not been disclosed. 


The Sunday appearance of the monarch was seen as an effort to reassure the public after he stepped back from public duties in early February following the diagnosis.