"Carloman I, also Karlmann (28 June 751 – 4 December 771) was king of the Franks from 768 until his death in 771. He was the ...
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second surviving son of Pepin the Short and Bertrada of Laon and was a younger brother of Charlemagne. His death allowed Charlemagne to take all of Francia and begin his expansion into other kingdoms." - (en.wikipedia.org 31.01.2020)