For centuries Troy was thought to be a myth created by Homer or whoever composed the Iliad. No one knew where it was, so there was no archeological evidence to prove it was real. Then, in 1868, the wealthy German businessman Heinrich Schliemann discovered the remains of the lost city.
There is not a single Troy, but rather several piled on top of each other. In all we have,
Troy I -- 3000-2600 B.C.
Troy II --2600-2250 B.C. - richest of the first five
Troy III -2250-2100 B.C.
Troy IV --2100-1950 B.C
Troy V ---1900-1700 B.C.
Troy VI --1600- 1400 B.C. - the most advanced fortress (destroyed by earthquake). Only one arrowhead found.
Troy VIIa 1300-1190 B.C. - shrunken recovery of VI in 1300 B.C. destroyed by man in 1200. Mycenaean pottery found here.
Troy VIIb 1190-1100 B.C. - short-lived