"I thought it can't be true. It was just sitting there as I scraped back the soil, shining, as if someone had just dropped it," Albert said in the statement.
The fact that the coin is much older than the archaeological layer in which it was found suggests it had been circulating for more than 300 years before it was lost.
Emperor Nero was one of the most controversial figures of the Roman era. He rose to power at the tender age of 16 under his mother's thumb, but went on to murder her and at least one of his wives.
He was also suspected of starting the great fire of Rome and then pinning the blame on Christians. He then executed many of them, burning the religious minority for sources of light in the evenings, setting wild dogs upon them or nailing them to crosses, according to the annals of Roman historian Tacitus.
In order to build an opulent, golden palace in Rome, Nero scrambled for financing, searching for the lost treasure of Queen Dido of Carthage and even looting treasures from Greek and Roman temples, the annals read.