The 2,300-strong congregation bowed as the monarch, the 62nd in history, have arrived back at Buckingham Palace where they will wave to crowds from the balcony.
William appeared to be overcome with emotion as he paid homage to his father, kneeling in front of him to give an oath of allegiance to King Charles during the historic first Coronation in 70 years.
The newly-crowned King and Queen have appeared on the Buckingham Palace balcony with a select group of senior royals as The Mall was swamped by tens of thousands of cheering patriots.