Mandos and Treebeard are just other versions or translations of the original name, not to mention the one that they are referred to most in the books. Angmar is neither his real name nor his dukedom, as he was not given it by a greater lord. We don't call Queen Elizabeth "Britain", do we?
No need to get so huffy....
__________________
"Monkeys learn sign language so they can tell the dolphins they love them."
|