Aberaman - Earliest Item Found  
The earliest item found was a Gold coin (Half noble) of Edward III, the coin can be dated from 1357 to 1377. It could have belonged to a Welsh Longbow man who lived in Aberaman who fought with the Black Prince at the Battle of Poitiers in 1356.

Note:

It is said that the king and prince had accepted the principle of pre-payment of the troops before setting sail to France, the men refused to set sail without an advance. Some of these men hid part of their money in wallets or leather purses under trees or walls until their return. As many of the archers did not come back the money would remain there unless discovered by others, as time went on the wallets and pouches would decay just leaving the money.