That appears to be a Dinero from Alfonso I "The Battler" of Aragon in what is now Spain. It would have been minted from 1104-1134 at Toledo.
A similar coin can be found here:
http://www.cngcoins.com/Coin.aspx?CoinID=187843
A similar coin can be found here:
http://www.cngcoins.com/Coin.aspx?CoinID=187843





















