The East Frisian chieftains used to provide shelter for pirates such as the famous Klaus Störtebeker and Goedeke Michel, who were a threat to the ships of the powerful Hanseatic League which they attacked and robbed.
Ida-Friisimaa pealikud andsid varjupaika piraatidele, nagu kuulus Klaus Störtebeker ja Gödeke Michels, kes olid ohuks võimsa Hansa Liidu laevadele, mida nad ründasid ja röövisid.