The Capitoline Museums (Italian Musei Capitolini) are a group of art and archeological museums in Piazza del Campidoglio, on top of the Capitoline Hill in Rome, Italy. The museums are contained in three palazzi surrounding a central trapezoidal piazza in a plan conceived by Michelangelo Buonarroti in 1536 and executed over a period of more than 400 years. The history of the museums can be traced to 1471, when Pope Sixtus IV donated a collection of important ancient bronzes to the people of Rome and located them on Capitoline Hill. Since then, the museums' collection has grown to include a large number of ancient Roman statues, inscriptions, and other artifacts; a collection of medieval and Renaissance art; and collections of jewels, coins, and other items. The museums are owned and operated by the municipality of Rome. The statue of a mounted rider in the centre of the piazza is of Emperor Marcus Aurelius. It is a copy, the original being housed on-site in the Capitoline museum. Many Roman statues were destroyed on the orders of Christian Church authorities in the Middle Ages; this statue was preserved in the erroneous belief that it depicted the Emperor Constantine, who made Christianity the official state religion of the Roman empire.