"Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge are carried from the boat from the dock to the plane in Marau on day 8 of their Diamond Jubilee tour of the Far East on September 18, 2012 in Honiara, Guadalcanal Island. Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge are on a Diamond Jubilee tour representing the Queen taking in Singapore, Malaysia, the Solomon Islands and Tuvalu"
https://hollywoodunlocked.com/social-media-resurfaces-image-of-prince-william-being-carried-on-throne-by-black-citizens-in-2012/
The people of the Solomon Islands are not 'Black' (as in having African roots), but Melanesians, which are Caucasoids, although sometimes clasified as Australoid by those who consider that a different race.
PS: In case you haven't heard, it IS William's people (English) who are responsible for making slavery a thing in the British Colonies, and their stock who were the main force in maintaining it in the South and wishing to spread it westward.