The imperial election of 1138 was an imperial election held to select the emperor of the Holy Roman Empire after the death of Lothair III in December 1137. The election took place in Koblenz on 7 March, eleven weeks before the scheduled date due to interference from Archbishop Albero of Trier.
Conrad III of Germany, who was previously an anti-king, was named Holy Roman Emperor as a result of the election, starting the Hohenstaufen imperial dynasty.
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Text from the Wikipedia article “1138 Imperial election”, available under CC BY-SA 4.0.