Plato

Some of Plato's Dialogs, Timeaus and Critias, include something about Atlantis, and were used as sources for this liturgy.

Here is the text of  Timaeus   with an article about it. and also a Wikipedia article about it.


Here is the text of  Critias , an article about it, and a Wikipedia article about Critias.


Timaeus provides  a brief introduction to Atlantis, while Critias includes a more detailed description.  These are the only historical written records about Atlantis.

Cleito

Cleito, a mortal woman,  was the daughter of Evenor and Leukippe, who dwelt on the central mountain of the island of Atlantis.

 With Poseidon, Cleito gave birth to five pairs of twin boys who became the rulers of Atlantis.   Their names were: Atlas and Eumelus (or Gadeirus); Ampheres, and Evaemon; Mneseus, and Autokhthon (Autochthon); Elasippus, and Mestor; and, finally, Azaes and Diaprepes.

Cleito's descendants were the rulers of Atlantis and the surrounding seas for untold generations.

Cleito and Atlantis are mentioned in the Kritias by Plato.

Stewart, Michael. "People, Places & Things: Cleito", Greek Mythology: From the Iliad to the Fall of the Last Tyrant.

Atlantis

Plato says Atlantis lay outside the Pillars of Hercules.

here are some articles about Atlantis:
Wikipedia article