Leoben (lāōˈbən) [key], city (1991 pop. 28,897), Styria prov., S central Austria, on the Mur River. An industrial center in a former mining region, it has large ironworks, lumber mills, a mining school, and breweries. An armistice between France and Austria, preliminary to the Treaty of Campo Formio, was signed (1797) at Leoben, concluding Napoleon I's victorious Italian campaign.
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