Michael Fawcett, his former valet who rose through the ranks to become chief executive of his charitable foundation, resigned in 2021 following the launch of an internal investigation into the accusations.
It was the latest claim to tarnish Fawcett -- and, by association, Charles.
In 2003, Fawcett resigned after being accused of bending palace rules and accepting valuable royal perks.
He was later cleared of allegations of financial misconduct over the sale of unwanted royal gifts, but an internal report found various members of Charles's household guilty of "serious failings".