ATHENS (Reuters) – European royalty gathered in Athens on Monday for the funeral of former King Constantine of Greece, born a prince but spurned by his country which abolished the monarchy in 1974. Constantine, a second cousin of Britain’s King Charles and Godfather to heir Prince William, lived most of his life in exile after a Greek referendum which rejected the monarchy in 1974. He died at the age of 82 last week in an Athens hospital. Known as “The Ex” or just “Glucksberg” – from the German House of Glucksberg which has connections with royalty throughout Europe, Constantine II was the onl…