Hamburg, city and Land (state), on the Elbe River in northern Germany, is the country’s largest port and commercial center.
========================================================================(in the Free and Hanseatic City of Hamburg, the second-largest city in Germany and 6th-largest in the EU. At the southern tip of the Jutland Peninsula, Hamburg stands on the branching River Elbe at the head of a 110 km (68 mi.) estuary to the North Sea, at the mouth of the Alster and Bille.
+ The name Hamburg comes from the first permanent building on the site, a castle that the Emperor Charlemagne ordered constructed in 808 CE. It rose on rocky terrain in a marsh between the River Alster and the River Elbe as a defence against Slavic incursion, and acquired the name Hammaburg (burg meaning castle or fort). The origin of the Hamma term is uncertain, but its location is estimated to be at the site of today's Hammaburgplatz (a lowland castle built in the early Carolingian period, from which the name of Hamburg is derived).
+ In 834 CE, Hamburg was designated as the seat of a bishopric. The first bishop, Ansgar, became known as the Apostle of the North. Two years later, Hamburg was united with Bremen as the Bishopric of Hamburg-Bremen. Hamburg was destroyed and occupied several times.
In 1189, by imperial charter, Frederick I "Barbarossa" granted Hamburg the status of a Free Imperial City and tax-free access (or free-trade zone) up the Lower Elbe into the North Sea. On 8 November 1266, a contract between Henry III and Hamburg's traders allowed them to establish a hanse in London.
+ In 1529, the city embraced Lutheranism, and it received Reformed refugees from the Netherlands and France. When Jan van Valckenborgh introduced another layer to the fortifications to protect against the Thirty Years' War in the 17th century, he extended Hamburg and created a "New Town" (Neustadt) whose street names date from the grid system of roads he introduced.