The theory of pile-dwellings, first put forward by the Swiss, Ferdinand Keller, is now 100 years old. According to this theory, there existed in prehistoric times buildings erected, not on dry land, but on artificial platforms raised on piles above the surface of the water.
This theory was based on well authenticated discoveries of the remains of settlements along the modern lake shores, in the first place on evidence from the south German, Swiss, French and Italian lakes. The very large number of piles found in connection with organic substances (wooden vessels, textiles, food stuffs and seeds) provided a basis for belief in the existence of such settlements. Moreover, the knowledge of modern pile-dwellings, especially in the South Seas, was cited in support of Keller's theory. So well was it grounded, that for over 70 years no one questioned the existence of prehistoric pile-dwellings.