While the coronation is a global event, it is also a family affair.
All eyes will be not just on Charles but also his sons William and Harry, who have faced ongoing tensions. Harry, who now lives in California, is attending the coronation without his wife or children.
Camilla's family is also front-and-center at the service, an unlikely position for her normally private children Tom Parker Bowles and Laura Lopes.
Three of Camilla's grandsons are serving as her pages, while George is serving as a page for Charles.
The coronation of Charles and Camilla marks the first time in British history that a divorced man and divorced woman have been crowned alongside each other, according to ABC News royal contributor Victoria Murphy.