
Grifo (726–753) was the son of the Frankish major domo Charles Martel and his second wife Swanahild. After the death of Charles Martel power may well have been intended to be divided among Grifo and his half-brothers Pepin the Younger (Pepin the Short) and Carloman. Grifo, considered illegitimate by Pepin and Carloman, was lured into a trap by h...
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http://en.wikipedia.org/wiki/Grifo

(from the article `Pippin III`) Charles had had a third son, howeverGrifo, who had been born to him by a Bavarian woman of high rank, probably his mistress. In 741, when his two ...
Found on
http://www.britannica.com/eb/a-z/g/71
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