or most of the past two millennia, no one thought much about Atlantis; it was just what it appeared to be: a fictional place mentioned in a fable by the ancient Greek philosopher. The idea that Atlantis was an actual lost historical location is a very recent idea, first proposed by a writer named Ignatius Donnelly in 1881. He believed that most of the important accomplishments of the ancient world — such as metallurgy, agriculture, religion and language — must have come from Atlantis. In essence, he argued that ancient cultures weren't sophisticated enough to develop these things on their own, so they must have spread from some unknown advanced civilization. (It is similar to the widely discredited "ancient astronauts" idea, that Egyptians were not smart enough to build pyramids, and thus extraterrestrials must have helped them.)