How did franck calvert know troy was at Hiserlik?

Franck Calvert discovered the location of ancient Troy at Hisarlik through a combination of archaeological research and local knowledge. He was influenced by earlier classical texts and the work of historians, which suggested that Troy was situated in the region of Hisarlik. Additionally, Calvert's excavations and observations of the site's stratigraphy provided further evidence that aligned with the descriptions of Troy, leading him to conclude that this was indeed the historical site of the legendary city.