Coins from the Roman Empire found buried in Okinawa Japan. Speculated to be from 3rd or 4th century. Found on the land of a castle than existed 12-15th century.
http://www.japantimes.co.jp/news/20...-unearthed-castle-ruins-okinawa/#.V-mBBMnDjak
http://www.japantimes.co.jp/news/20...-unearthed-castle-ruins-okinawa/#.V-mBBMnDjak