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In page Hanseatic League:

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Even at its peak, the Hanseatic League remained a loosely aligned confederation of cities. It lacked a permanent administrative body, a treasury, and a standing military force. The Grand Master of the Teutonic Order was often seen as the head of the Hansa (caput Hansae), both abroad and by some League members. The Teutonic Order was an official member of the Hanseatic League[citation needed], unique as the only autonomous landed state to hold membership, while other members were cities or individual merchants. The Order and the Hanseatic League had a close economic and military interdependency, with many important Hanseatic trading ports falling within the Order's territories, and the Order itself played a role in protecting and organizing Baltic trade networks.