The main trade currency during the early medieval period in Europe was the silver penny, also known as the "penny" or "denarius." As trade revived after the fall of the Roman Empire, coins became essential in facilitating commerce across regions. The silver penny, minted by various kingdoms, provided a standardized medium of exchange that merchants and traders could rely on. Additionally, trade routes expanded, connecting local economies to larger markets, thus enhancing the importance of effective currency. The use of coins resulted in increased trade efficiency and helped develop a more interconnected economy during the medieval era.