Which historian and philosopher first introduced us to the “Lost City of Atlantis”?

Interesting fact:

We all know of Atlantis, the legendary island that sank into the sea in a single day and night and that supposedly could still exist with its remnants in prime state. The Lost City of Atlantis has been imagined as a crown city of Neptune, where mermaids and mermen exist. Whether you believe it or not, what does exist with certainty are the two books that a philosopher penned describing Atlantis: Timaeus and Critias. Today we have a complete version of the latter, but the former is only a partially completed work.