The Original "He Who Must Not Be Named"
Being the oldest to the Big Three Gods of the Ancient Greek World, Hades was the god that ruled over the Underworld, also known the the Greeks as the world of death. Since he is associated with death, Hades' name was rarely mentioned in the Greek society, so whenever the people of Greece want to refer to him, they say "he who must not be named". Since then, the phrase is used often in people's everyday speech, even now, so Hades then became the origin of the phrase.
Other than Hades, and "he who must not be named", the God of the Underworld was also known be many other names, such as the Lord of Ghosts and Spirits, the Unseen One, the Silent One, the Host of Many, and the King of the Dead.
Other than Hades, and "he who must not be named", the God of the Underworld was also known be many other names, such as the Lord of Ghosts and Spirits, the Unseen One, the Silent One, the Host of Many, and the King of the Dead.