Definition of Brienne
1 former county of northeastern France in the region of Champagne north-northeast of Troyes
2 or in full Brienne–le–Château play \-lə-shä-ˈtō\ town in the region of Champagne, northeastern France population 7702 ◆The town of Brienne-le-Château served as capital of the former county of Brienne.
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