A challenge coin is a small coin or medallion, bearing an organization's insignia or emblem and carried by the organization's members. Traditionally, they might be given to prove membership when asked and to enhance morale. They are also collected by service members and law enforcement personnel. Historically, challenge coins were presented by unit commanders in recognition of special achievement by a member of the unit. They could also be exchanged in recognition of visits to an organization. Modern day challenge coins may feature popular culture attributes or organizational values. Modern challenge coins are made in a variety of sizes and are often made using popular culture references, including superheroes and other well-known characters in a way that creates a parody. Origins There are several stories detailing the origins of the challenge coin. Many originate in popular culture based on current events. The Roman Empire rewarded soldiers by presenting them with coins to recognize their achievements. In Rome, if soldiers excelled in battle one day, they would receive their typical day's wages along with a separate bonus coin each. According to some accounts, these bonus coins were specially minted, featuring the marks of the legions from which they came. As a result, some soldiers apparently kept their coins as mementos, instead of spending them. Challenge coins were also known as "Portrait Medals" during the Renaissance and were often used to commemorate specific events involving royalty, nobility, or other types of well-to-do individuals. The medals would be given as gifts or awards, and people also exchanged them with friends and associates. The most common format was for one side to depict the patron while the other showed something that represented that individual's family, house, lineage, and/or seal. The first instance of using a coin as a response to an actual challenge may come from the 17th century religious wars in France. Following King Louis XIV's 1685 revocation of the Edict of Nantes, French Protestants began to suffer persecution by the state for their illegal religion. Many Protestants fled France to find religious freedom elsewhere. Among those who chose to remain in France were some from a Protestant group known as Huguenots who were forced to conduct their religious services in secret. In order to avoid infiltration by state spies the Huguenots began to carry their méreau communion coin. When challenged while trying to gain entry to Protestant church services the Huguenot would