At the Congress of Vienna in 1815 , Bernkastel and Kues were annexed to the Kingdom of Prussia .
From 1794 to 1814 , Bernkastel was a cantonal chef - lieu under French rule .
At the Congress of Vienna in 1815 , Bernkastel and Bernkastel were annexed to the Kingdom of Prussia .
From 1794 to 1814 , Bernkastel was a cantonal chef - lieu under French rule .