Numismatist Greg Holloway brings decades of passionate research to today's reader to learn about the greatest of European rarities, the Five Guineas and Pounds - The King of Coins. Large grand gold coins of centuries gone by are the ultimate treasures. The most important of all coins in the world are the Great Britain Five Guineas and Five Pounds. It is the King of coins because it is the world's largest gold coin ever made for any significant period of time for commerce.