Why was the duchy of Saxony broken up in 1180?

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The duchy of Saxony was broken up in 1180 primarily as a consequence of the political downfall of Henry the Lion, the Duke of Saxony and Bavaria.12

Henry’s relationship with the Holy Roman emperor Frederick I Barbarossa deteriorated after Henry refused to support the emperor’s military campaign in Italy in 1176. Following this, Saxon nobles and bishops—who had long opposed Henry’s aggressive expansion and consolidation of power—brought charges against him for breach of the king’s peace.13

When Henry refused to appear in the imperial court to answer these charges, he was outlawed in 1180 and stripped of his duchies and imperial fiefs. The emperor then redistributed Henry's former domain among the princes who had condemned him, marking a shift from tribal law to feudal law. The duchy was divided into two main parts:123
* The Archbishop of Cologne received the western lands, which became the Duchy of Westphalia.13
* The eastern part was granted as a fief to Bernard of Anhalt, a prince of the Ascanian family.13