Gordium

Gordion was the capital city of ancient Phrygia. It was located at the site of modern Yassıhüyük, about 70–80 km southwest of Ankara, in the immediate vicinity of Polatlı district. Gordion's location at the confluence of the Sakarya and Porsuk rivers gave it a strategic location with control over fertile land. Gordion lies where the ancient road between Lydia and Assyria/Babylonia crossed the Sangarius river.

Source: Wikipedia