The signs of first communal settlements in Istanbul and its surroundings date back to long years ago. While the first traces extend back to 6. Century B.C., it was discovered by research that some communities have lived in both Anatolian and European side of Istanbul. These first habitants had first lived as nomads and semi-nomads. Then they adopted a communal way of life based on fishing, agriculture and cattle breeding. Especially in researches in Fikirtepe, it was found out that back in year 6000 B.C, animals such as dogs, goats, cattle and pigs were domesticated and the habitants took up fishing. In the advent of 3000 B.C., there is an intense settlement activity starting in Istanbul. This period enabled the arising of small governed city units (beylik). Researches reveal that Sultanahmet Square of today and its surroundings had been center to a major settlement.