Pisa is a city in Tuscany, Central Italy, on the right bank of the mouth of the River Arno on the Tyrrhenian Sea. It is the capital city of the Province of Pisa. Although Pisa is known worldwide for its Leaning Tower (the bell tower of the city's cathedral), the city of over 87,500 residents contains more than 20 other historic churches, several palaces and various bridges across the River Arno. The city is also home of the University of Pisa, which has a history going back to the 12th century.Ancient times Pisa's origins remained unknown for centuries. The city lies at the junction of two rivers, the Arno and the Serchio in the Ligurian Sea forming a laguna area. The Pelasgi, the Greeks, the Etruscans and the Ligurians have variously been proposed as founders of the city. Archeological remains from the 5th century BC confirmed the existence of a city at the sea, trading with Greeks and Gauls. The presence of an Etruscan necropolis, discovered during excavations in the Arena Garibaldi in 1991, allowed to clarify its Etruscan origins. Ancient Roman authors referred to Pisa as an old city. Servius wrote that the Teuti, or Pelopes, the king of the Pisei, founded the town thirteen centuries before the start of the common era. Strabo referred Pisa's origins to the mythical Nestor, king of Pylos, after the fall of Troy. Virgil in his Aeneid states that Pisa was already a great and developed centre by the times described; the foundation of the city in the 'Etruscan lands' has been credited to settlers from the Alpheus coast. Old half of Pisa (view from Leaning Tower) The maritime role of Pisa should have been already prominent if the ancient authorities ascribed to it the invention of the rostrum: it took advantage of being the only port along the western coast from Genoa (then a small village) to Ostia. Pisa served as a base for Roman naval expeditions against Ligurians, Gauls and Carthaginians. In 180 BC, it became a Roman colony under Roman law, as Portus Pisanus. In 89 BC, Portus Pisanus became a municipium. Emperor Augustus fortified the colony into an important port and changed the name in Colonia Iulia obsequens. From 313 it became the seat of a bishopric. ( source Wikipedia )