Yet the ancient coins -- ten in total -- were only discovered recently when Toshio Tsukamoto, a researcher from Gangoji temple cultural properties department, spotted them when he traveled to the castle from Nara. The Uruma Board of Education announced their discovery Monday. I'd come to analyze artifacts like Japanese samurai armor that had been found there when I spotted the coins," Tsukamoto, told CNN.
"I'd been on excavation sites in Egypt and Italy and had seen a lot of Roman coins before, so I recognized them immediately." The coins were later submitted to Miyagi, who examined them using X-ray technology.
"You can see the engravings on the coins clearer when you use X-rays," Miyagi, told CNN. The archeologist found that the Ottoman coin had inscriptions that dated it to 1687, while the Roman coins appeared to be much older -- from at least 300 to 400 AD.