buildings. In total there were 4 gates, one on each side of the city. The walls followed the course of the two rivers that surround the city, the Kemonia and the Papireto, creating a natural moat and improving the military security of the city. During the Roman era they were reinforced. The Cassaro district was probably named after the walls themselves; the word Cassaro deriving from the Arab al-qaṣr (castle, stronghold, see also alcázar). The colony developed around a central street (decumanus) now the Corso Vittorio Emanuele. Carthage was Palermo's major trading partner under the Phoenicians and the city enjoyed a prolonged peace during this period. Palermo came into contact with the Ancient Greeks between the 6th and the 5th centuries BC which preceded the Sicilian Wars, a conflict fought between the Greeks of Syracuse and the Carthaginians for control over the island of Sicily. During this war the Greeks named the settlement Pánormos or 'wide haven' due to its large anchorage, from which the present name of the city developed. The Carthaginians began using the Greek name on the city's coinage from the 5th centuryBC. It was from Palermo that Hamilcar I's fleet (which was defeated at the Battle of Himera) was launched. In 409 BC the city was looted by Hermocrates of Syracuse. The Sicilian Wars ended in 265 BC when Syracuse allied with the Romans of Italy and pushed the Carthaginians off of the island during the First Punic War. In 276 BC, during the Pyrrhic War, Panormos briefly became a Greek colony after being conquered by Pyrrhus of Epirus, but returned to Phoenician Carthage in 275 BC. In 254 BC Panormos was besieged and conquered by the Romans. Carthage attempted to reconquer Panormus in the battle of Panormus 250 BC but failed. In Roman times luxurious residences were built and have been found in several locations (piazza Sett'Angeli, Palazzo Sclafani, piazza della Vittoria). Middle Ages As the Roman Empire was falling apart, Palermo fell under the control of several Germanic tribes. The first were the Vandals in 440 AD under the rule of their king Geiseric. The Vandals had occupied all the Roman provinces in North Africa by 455 establishing themselves as a significant force. They acquired Corsica, Sardinia and Sicily shortly afterwards. However, they soon lost these newly acquired possessions to the Ostrogoths. The Ostrogothic conquest under Theodoric the Great began in 488; Theodoric supported