evidence: etymology: Lisbon is one of Europe's oldest cities (the second oldest capital city after Athens) and the origin of the name is lost in time; it may have been founded as an ancient Celtic settlement that subsequently maintained close commercial relations with the Phoenicians (beginning about 1200 B.C.); the name of the settlement may have been derived from the pre-Roman appellation for the Tagus River that runs through the city, Lisso or Lucio; the Romans named the city "Olisippo" when they took it from the Carthaginians in 205 B.C.; under the Visigoths the city name became "Ulixbona," under the Arabs it was "al-Ushbuna"; the medieval version of "Lissabona" became today's Lisboa [...] embassy: Avenida das Forcas Armadas, 1600-081 Lisboa mailing address: 5320 Lisbon Place, Washington DC 20521-5320 telephone: [351] (21) 727-3300 [...] Portugal-Spain: Portugal does not recognize Spanish sovereignty over the territory of Olivenza based on a difference of interpretation of the 1815 Congress of Vienna and the 1801 Treaty of Badajoz