Information:  - The Palatine Hill  is the centermost of the Seven Hills of Rome and is one of the most ancient parts of the city. It stands 40 metres above the Roman Forum, looking down upon it on one side, and upon the Circus Maximus on the other.  - The Circus Maximus (Latin for "greatest" or "largest circus", in Italian Circo Massimo) is an ancient Roman chariot racing stadium and mass entertainment venue located in Rome, Italy. Situated in the valley between the Aventine and Palatine hills, it was the first and largest stadium in ancient Rome and its later Empire. It measured 621 m (2,037 ft) in length and 118 m (387 ft) in width and could accommodate over 150,000 spectators. In its fully developed form, it became the model for circuses throughout the Roman Empire. The site is now a public park.  - Pietro Rosa ( November 10 , 1810 , Rome -- August 15 , 1891 , Rome ) was an Italian architect and topographer . He studied the settlements of the ancient Roman countryside and carried out a systematic series of excavations on the Palatine Hill in Rome . One of Rosa 's ancestors was Salvator Rosa ( 1615 - 1673 ) ; Pietro was an avid patriot for the defense of the city of Rome in 1849 during the Roman Republic . A student of Luigi Canina , Rosa was an avid scholae of Rome and Latium . From 1861 - 1870 he carried out his excavations on the Palatine with the patronage of emperor Napoleon III. He also edited the Carta topografica del Lazio , an archaeological plan that he designed between 1850 and 1870 on a scale of 1:20,000 . The map , measuring 3,40 x 3,10 m , is a unique and valuable study of the territory of Latium ( modern Lazio ) and the archaeological remains there . The work was completed only in certain areas , such as the Tyrrhenian coast , Tibur and Palestrina . Rosa was named archaeological superintendent at Rome by royal decree on March 26 , 1871 . In the following years he was inspector general of antiquities in the ministry of public instruction and he was made a senator on December 1 , 1870 .    Given the information above, choose from the list below the object entity that exhibits the relation 'country of citizenship' with the subject 'pietro rosa'.  Choices: - italy  - roman empire
Answer:
italy