Theories: Atlantis

A long time ago a beautiful, tropical, mass of islands was ruled by 1 master king and 9 petty-kings. This paradise was Atlantis.
Atlantis was the home to many intelligent and good looking people.
Atlantis was the home to modern civilization, where time, writing, math, science, art and many other things were developed there. Thus Atlanteans became very wealthy.
Atlanteans enjoyed the good life with many blessings for thousands of years, when suddenly Atlantis disappeared beneath the ocean, never to be found again.