Text: When he saw that earlier settlers had built a town on the eastern shore of the Bosphorus, he decided they must have been blind themselves to overlook the advantages of an easily defensible point across the water, and founded Byzantium there, on the site now occupied by Topkap?? Palace.
Entailment: The city of Byzantium was founded at an easily defensible position of the western shore of the Bosphorus.
Contradiction: The site where Byzantium was founded is now home to a football stadium.