Tomorrow is the release date of a new Arthurian film, The Last Legion. The idea here seems to be that King Arthur was Romulus Augustus, who as I recall was the last Roman emperor to rule from Rome itself.
Wouldn't Geoffrey of Monmouth be surprised to see what had become of his king? Of course, when the Romans demand tribute from the Britons in Geoffrey's History of the Kings of Britain, Arthur responds that the Romans ought to be the ones giving him tribute. Maybe this is the tribute he's been waiting for. Just in case this turns out to be the case, let's keep a lookout for incoming vessels from Avalon.