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I don't have sufficient context to write an accurate overview of "1155" based solely on the information provided. To give you an accurate 2-sentence overview, I would need additional details about what "1155" refers to — whether it's a historical event, a place, a document, a code, or something else entirely.
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Article
Emperor Frederick I (middle) flanked by his two sons, Henry VI and Frederick VI. Year 1155 (MCLV) was a common year starting on Saturday of the Julian calendar.
Events