The Roman mosaic, which spent half a century in an apartment in Manhattan, dates back to the period of emperor Caligula’s reign.... Caligula was in control of the Roman Empire from 37 AD until he was assassinated in 41 AD.... The spectacular artefact featured on the CBS show ‘60 Minutes’ on Sunday, where Dario Del Bufalo, a marble expert from Italy, explained how he stumbled upon the ultra-rare artefact by chance.Mr Del Bufalo cast his memory back to 2013, when he was at his book signing for h