+The year 1157 saw shifting powers across medieval [Europe](/wiki/Europe). [Frederick I](/wiki/Frederick_I), known as Barbarossa, continued to assert authority within the Holy Roman Empire, while conflicts and alliances shaped emerging nations.
+## See also
+- [Middle Ages](/wiki/Middle_Ages)
+- [Holy Roman Empire](/wiki/Holy_Roman_Empire)
+- [12th Century](/wiki/12th_Century)