1151 CE

Confronted with internal strife, the commune of Bologna is the first Italian republic to turn to the rule of a podestà, Guido di Ranieri da Sasso (it ends in 1155). Anping Bridge is completed in China's Fujian province. Its total length will not be exceeded until 1846. The first plague and fire insurance policy is issued in Iceland.

Geopolitics & Diplomacy

Confronted with internal strife, the commune of Bologna is the first Italian republic to turn to the rule of a podestà, Guido di Ranieri da Sasso (it ends in 1155).source

Conflict & Security

After the Battle of Ghazni, the city is burned by the Prince of Ghur.source

Religion & Belief

Bolton Abbey is founded in North Yorkshire, England.source

Technology & Infrastructure

Anping Bridge is completed in China's Fujian province. Its total length will not be exceeded until 1846.source

Health & Medicine

The first plague and fire insurance policy is issued in Iceland.source

Births

April 3 – Igor Svyatoslavich, Russian prince (d. 1202)source
May 9 – al-Adid, last Fatimid caliph (d. 1171)source
Unkei, Japanese sculptor (d. 1223)source

Deaths

January 13 – Abbot Suger, French statesman and historian (b. c. 1081)source
April 23 – Adeliza of Louvain, queen of Henry I of England (b. 1103)source
September 7 – Geoffrey of Anjou dies, and is succeeded by his son Henry, aged 18.source
September 7 – Geoffrey V, Count of Anjou (b. 1113)source
Li Qingzhao, Chinese poet (b. 1084)source