This nearly 5-foot tall sculpture in the Capitoline Museums is missing a finger.
A piece which the Louvre Museum in Paris had been unable to identify in its collection for over 150 years.
The Louvre has lent the missing piece to the Capitoline Museums in Rome, where it will form part of the hand of Constantine.
The sculpture is exhibited alongside the head that was part of the original statue, as well as a sphere that was in its hand.
Pope Sixtus IV gave the sculpture to the city of Rome in 1471, and it was the first piece in the Capitoline Museums.
The finger was bought by France in 1860 as part of a collection of the Marquis Giampietro Campana, who went bankrupt after being accused of embezzlement.
Now, for a time, it returns to Rome.
JMB
TR: JM