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During the third crusade, on 10 June 1190, Emperor Frederick Barbarossa drowned near Silifke Castle in the Saleph river. Accounts of the event are conflicting. Some historians believe he may have had a heart attack that complicated matters. Some of Frederick's men put him in a barrel of vinegar to preserve his body.
https://en.wikipedia.org/wiki/Frederick_I,_Holy_Roman_Emperor
During the third crusade, on 10 June 1190, Emperor Frederick Barbarossa drowned near Silifke Castle in the Saleph river. Accounts of the event are conflicting. Some historians believe he may have had a heart attack that complicated matters. Some of Frederick's men put him in a barrel of vinegar to preserve his body.
https://en.wikipedia.org/wiki/Frederick_I,_Holy_Roman_Emperor