|Centuries:||11th century – 12th century – 13th century|
|Decades:||1120s 1130s 1140s – 1150s – 1160s 1170s 1180s|
|Years:||1154 1155 1156 – 1157 – 1158 1159 1160|
- June 11 Albert I of Brandenburg, also called, The Bear (Ger: Albrecht der Bär), became the founder of the Margraviate of Brandenburg, Germany and the first Margrave
- 23 October—Battle of Grathe Heath. A civil war in Denmark ended with the death of king Sweyn III. Valdemar I became king of all Denmark and restored and rebuild the country.