Actually, this song is based first and foremost off of "The Once and Future King," by T. H. White, its namesake. The song most likely takes the point-of-view of Sir Bedivere, who, as Gareth mentioned, was the last one to to see Arthur alive. "When I cry out for the bark, take him back to Avalon" describes the magical boat that brings Arthur to the forging place of Excalibur, where the three witches, including Morgan le Fay, are to take care of him until he is once again needed (Reincarnated).
Actually, this song is based first and foremost off of "The Once and Future King," by T. H. White, its namesake. The song most likely takes the point-of-view of Sir Bedivere, who, as Gareth mentioned, was the last one to to see Arthur alive. "When I cry out for the bark, take him back to Avalon" describes the magical boat that brings Arthur to the forging place of Excalibur, where the three witches, including Morgan le Fay, are to take care of him until he is once again needed (Reincarnated).