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In page Braunschweig:
"Henry the Lion became so powerful that he dared to refuse military aid to the Emperor Frederick I Barbarossa, which led to his banishment in 1182. Henry went into exile in England. He had previously established ties to the English crown in 1168, through his marriage to King Henry II of England's daughter Matilda, sister of Richard the Lionheart.[2] However, Henry's son Otto, who regained influence and was eventually crowned Holy Roman Emperor, continued to foster the city's development.[citation needed]
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