7 January 1131 – Canute Lavard is assassinated after being lured into a forest by Magnus the Strong. Soon after, Eric II amasses forces to avenge his half-brother's death, resulting in the Battle of Jellinge Heath and the outbreak of the Danish Civil Wars.
1131–1132 – Supporters of Magnus the Strong lay Siege to Schleswig.
1132 – Eric II's forces defeat supporters of Magnus the Strong in the naval Battle of Sejerø.
1133 – Magnus' supporters defeat the forces of Eric II and conquer Zealand at the Battle of Værebro.
4 June 1134 – Eric II's forces are victorious against supporters of Magnus at the Battle of Fotevik.
1134 – Pomeranian forces invade and loot Roskilde and Copenhagen.
23 October 1157 – the Danish Civil War ends following the Battle of Grathe Heath. Valdemar I becomes undisputed king of Denmark.
1147 – Danish forces attack Dobin am See as part of the Wendish Crusade.
1168 – Valdemar I and his army attack Rügen. Overthrowing the Rani's autonomy, destroying a Svetovid temple, and installing Christian princes.
Births
1127 – Esbern Snare (died 1204)
14 January 1131 – Valdemar I of Denmark (died 1182)
1158 – Valdemar Knudsen (died 1236 in Cîteaux)
28 June 1170 – Valdemar II of Denmark (died 1241)
1174 – Ingeborg of Denmark, Queen of France (died 1237 in France)
Date unknown
c. 1100 – Saint Kjeld (died c. 1150)
c. 1106 – Magnus the Strong (died 1134 in Scania)
c. 1118 – Christina of Denmark, Queen of Norway (died 1139)
c. 1120 – Eric III of Denmark (died 1146)
c. 1125 – Sweyn III of Denmark (died 1157)
c. 1128 – Absalon (died 1201)
c. 1129 – Canute V of Denmark (died 1157)
c. 1135 – Helen of Sweden
c. 1145 – Christina Hvide (died c. 1200)
c. 1150 – Saxo Grammaticus (died c. 1220)
c. 1165 – Benedicta Hvide (died c. 1199 in Sweden)
c. 1167 – Anders Sunesen (died 1228)
c. 1180 – Helena of Denmark (died 1233 in Lüneburg)
c. 1190 – Richeza of Denmark, Queen of Sweden (died 1220)
Deaths
10 July 1103 – Eric I of Denmark (born c. 1060, died in Cyprus)
1103 – Boedil Thurgotsdatter, Queen consort (died in Jerusalem)
1104 – Svend Tronkræver
7 January 1131 – Canute Lavard (born 1096)
4 June 1134 – Henrik Skadelår (born c. 1090)
25 June 1134 – Niels, King of Denmark (born c. 1063)
1134 – Bjørn Haraldsen Ironside
1135 – Harald Kesja (born c. 1080)
18 September 1137 – Eric II of Denmark (born c. 1090)
27 August 1146 – Eric III of Denmark (born c. 1120)
16 January 1151 – Hermann of Schleswig
1151 – Asser Rig (born c. 1078)
9 August 1157 – Canute V of Denmark (born c. 1129)
23 October 1157 – Sweyn III of Denmark (born c. 1125)