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| Millennium: | 2nd millennium |
| Centuries: | 11th century – 12th century – 13th century |
| Decades: | 1120s 1130s 1140s – 1150s – 1160s 1170s 1180s |
| Years: | 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 |
| Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
The 1150s decade ran from January 1, 1150, to December 31, 1159.
Events and trends
- Peter Lombard writes his Sentences.
- Eric the Saint, king of Sweden led the first Christian crusade to Finland.
- The Synod of Kells-Mellifont established the present diocesan system of Ireland (with later modifications) and recognzed the primacy of Armagh.
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