History
1147
General
Population: 347 Million*
- History: Geoffrey of Monmouth writes "Historia regum Britanniae"
- Mathematics: Arabic algebra work Al-jebr translated into Latin
- Religion: Start of Second Crusade following appeal by St. Barnard of Clairvaux to 1149
Africa
- Morocco: Almohads, opposed group to Almoravids seize Marrakech and go on to capture Spain, Algeria, and Tripoli
Europe
- General: French and Germans begin second crusade
Crusaders against the pagan Wends (Slavs) in the Baltic
- England: Matilda leaves England for France
- Portugal: Crusaders take Lisbon
Lisbon cathedral built
- Russia: First mention of Moscow
- Spain: Almohads, opposed group to Almoravids seize Marrakech and go on to capture Spain, Algeria, and Tripoli
Middle East
- Christian Crusaders engage Turks in Palestine
Crusaders perish in Asia Minor – failure of Second Crusade – failure to capture Damascus
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