Person
Plato
Timaeus and Critias, fourth century BCE, are the earliest known literary Atlantis. A sea power loses a war with an ancient Athens and sinks.
Max Naylor, “Doggerland”, CC BY-SA 3.0, via Wikimedia Commons
Whether he adapted an older tradition is disputed. No independent archaeology has confirmed his island. Channelings inherit the name and fill it with technology and dates he did not write.