Pirate Flags

Jolly Roger is the traditional English name for the flags flown to identify a pirate ship about to attack, during the early 18th century (the later part of the Golden Age of Piracy).

Jolly Roger flags, Skull and Crossbones, Pirate Flag of Jack Rackham. The earliest documented instances of piracy were in the 14th century BC, when the Sea Peoples, a group of ocean raiders, attacked the ships of the Aegean and Mediterranean civilizations. Wikipedia