King Charles III was publicly proclaimed king.

When his mother, Queen Elizabeth II, passed away, Charles immediately became king. 

However, the accession ceremony is a crucial constitutional and ceremonial step in introducing the new monarch to the nation.

Following the passing of Queen Elizabeth on Thursday, King Charles III was formally declared monarch on Saturday during an investiture ceremony at St James's Palace in London.

At the end of the ceremony, a royal representative publicly proclaimed King Charles III the monarch from a balcony inside the palace.

The announcement was delivered by David White, the Garter King of Arms, who was surrounded by trumpeters wearing gold-trimmed robes. He then led the cheers, "Hip, hip, hooray!" for the new king.