Posted July 01, 2011
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The term you're searching for is 'Hanseatic'.
Sources:
http://www.yourdictionary.com/Hanseatic:
'Webster's New World College Dictionary, 4th Ed
Han·seatic
adjective
of the Hanse or the towns that formed it
Origin: ML hanseaticus'
http://unabridged.merriam-webster.com:
'Main Entry: han·se·at·ic
Function: adjective
Usage: usually capitalized
Etymology: Medieval Latin Hanseaticus, from hansa'