Hippana was an ancient town of Sicily, mentioned by Polybius as being taken by assault by the Romans in the First Punic War, 260 BCE. Diodorus, in relating the events of the same campaign, mentions the capture of a town called 'Sittana', for which we should in all probability read 'Hippana'. It sat astride the main road from Panormus (modern Palermo) to Agrigentum (modern Agrigento) upon Monte dei Cavalli.
Some manuscripts of Pliny mention the name of Ipanenses in his list of Sicilian towns, where the older editions have Ichanenses. If this reading be adopted, it in all probability refers to the same place as the Hippana of Polybius; but as the reading Ichanenses is also supported by the authority of Stephanus (who notices Ichana as a town of Sicily), the point must be considered doubtful.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.