Atlantis

Atlantis is a underwater lost city, little to nothing is know about the city and it's inhabitants.

Season 8
"Our crest. The Aquarian Star, representing great magic and power. They say it stood at the gates of Atlantis itself."

- Henry Winchester

In season 8 episode 12, As Time Goes By, Henry Winchester states that some people say that the Aquarian Star "stood at the gates of Atlantis itself".

Season 12
"The oldest of the old demons. The first generation after Lilith. Lucifer turned them himself, before the oceans drank Atlantis."

- Crowley

In season 12 episode 12, Stuck in the Middle (With You), Crowley states that after turning Lilith, Lucifer turned the Princes of Hell into demons himself, before the oceans had "drank" Atlantis.

Appearances

 * Season 8
 * As Time Goes By
 * Season 12
 * Stuck in the Middle (With You)

Trivia

 * In many portraits of Atlantis in media over the years, some of them have represented Atlanteans as humans that died in the sink of the city, others represent them as humanoid underwater creatures. It's unknown wich one is the case in the Supernatural franchise.