Ogyges was the founder and king of Thebes in Greece. During his reign a devastating flood ruined the country to such an extent that it remained without kings until the reign of Cecrops. Some writers have identified the Flood of Ogyges with the Flood of Deucalion. It is more likely that they were separate events and were part of the series of floods noted by Plato [Tim.22 & Crit.111-112].
Frank Joseph in Survivors of Atlantis points out that Plato in his Laws dated the Ogygean flood to less than two thousand years before his time, a figure compatible with the date of 2136 BC given by Varo the Roman writer.
Oliver D.Smith maintains that it was the flood of Ogyges that destroyed Atlantis and argues that this event occurred long before the Flood of Deucalion(a).
(a) http://www.academia.edu/3507001/Atlantis_as_Sesklo (now offline)