Camilla has stepped in to lead the royals after Prince William pulled out of attending the memorial service for his godfather due to a personal matter.
Inside royal divorces: Princess Margaret and Antony Armstrong-Jones, Prince Andrew and Sarah Ferguson, Princess Anne and Captain Mark Phillips and more announcing their marriage splits.
The third and final day saw the Princess Royal, 73, visit the Vajira Pillayar Kovil, a Hindu Temple in the capital and receive the blessing of the chief priest.
High-profile royals, including Constantine s son Crown Prince Pavlos and widow Queen Anne Marie, attended a private ceremony at the former summer palace of Tatoi, just outside Athens.