The Leonine City is that part of the city of Rome around which Pope Leo IV commissioned the construction of a wall for military defense during the 9th century. It is on the opposite side of the Tiber from the seven hills of Rome. Location within Italy The Roman Colosseum Rome (Italian and Latin: Roma) is the capital city of Italy and of its Latium region. ... Leo IV, pope from 847 to 855, was a Roman by birth, and was unanimously chosen to succeed Sergius II. His pontificate was chiefly distinguished by his efforts to repair the damage done by the Saracens during the reign of his predecessor to various churches of the city, especially those... Tiber River in Rome The River Tiber (Italian Tevere), the third longest river in Italy (disputed — see talk page) at 406 km (252 miles) after the Po and the Adige, flows through the Campagna and Rome in its course from Mount Fumaiolo to the Tyrrhenian Sea, which it reaches in... The Seven Hills of Rome east of the Tiber form the heart of Rome. ...