Source:
https://scmp.com/article/550030/mane-event

The mane event

The emperor rides again: an equestrian statue of Marcus Aurelius, the finest to survive from the glory years of ancient Rome, is on display once more, having galloped into a new, purpose-built home in the Capitoline Museum.

Aurelius (AD121-180) is drawing big crowds to the museum that flanks the Piazza del Campidoglio. Until 1981, he could be found saddled up in the Michelangelo-designed square, but was removed when the extent of pollution damage to his bronze became apparent. He and his mount were replaced by a dark brown copy that lacked the rich grey-green patina of the original.