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14. PEPIN, Bapt at Rome, 12 Apr. 781, by Pope Adrian I, d. Milan, 8 July 810, King of Italy 781-810, consecrated King of Lombardy 15 Apr 781. Apparently by a dau. of Duke Bernard, yngr. bro. of Pepin the Short, he had Bernard a natural son. (NEHGR 109: 179-178. West Winter, II.4)
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Wikipedia
Pepin was the second son of Charlemagne by his then-wife Hildegard.[1] He was born Carloman, but was rechristened with the royal name Pepin (also the name of his older half-brother Pepin the Hunchback, and his grandfather Pepin the Short) when he was a young child. He was made "king of Italy"[2] after his father's conquest of the Lombards, in 781, and crowned by Pope Hadrian I with the Iron Crown of Lombardy.