Patras (Greek: Πάτρα, romanized: Pátra .mw-parser-output .IPA-label-small{font-size:85%}.mw-parser-output .references .IPA-label-small,.mw-parser-output .infobox .IPA-label-small,.mw-parser-output .navbox .IPA-label-small{font-size:100%}pronounced [ˈpatra] ⓘ; Katharevousa and Ancient Greek: Πάτραι;[a] Latin: Patrae[b]) is Greece's third-largest city and the regional capital and largest city of Western Greece, in the northern Peloponnese, 215 km (134 mi) west of Athens. The city is built at the foot of Mount Panachaikon, overlooking the Gulf of Patras. As of the 2021 census, the municipality of Patras has a population of 215,922, while the urban population is 173,600. The core settlement has a history spanning four millennia. In the Roman period, it had become a cosmopolitan center of the eastern Mediterranean whilst, according to the Christian tradition, it was also the place of Saint Andrew's martyrdom.