||Swanahild (Agilolfing) von Bayern was a member of aristocracy in ancient Europe.|
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Cawley also states that she was a niece of Odilo, Duke of Bavaria 
Einhard names "Swannhilde neptem Odilonis ducis Baioariorum" as the mother of Grifo. The precise relationship between Suanhilde and Pilitrude, who was the wife in turn of the brothers Grimoald and Theodoald, has not been identified. 
In the absence of any indication of her birth year, assume she was aged 30 when she became the second wife of Charles Martel in 725, hence born, say, 695.
The Continuator of Fredegar records that "matrona quondam…Beletrude et nepta sua Sunnichilde" were captured and taken to Austrasia by Charles "Martel" in [724/25]. 
In 725 she married, as his second wife, Charles “Martel” maiordomus of Austrasia and Neustria, son of Pepin "le Gros" or "d'Herstal" & his second wife Chalpais [Alpais], who was born in 690 and died in Quierzy-sur-Oise, Aisne 22 Oct 741, and was buried in the église de l'abbaye royale de Saint Denis). 
She instigated the marriage of her stepdaughter to Odilo Duke of Bavaria according to the Continuator of Fredegar. After the death of her husband, she incited her son to rebel against her stepsons. 
She was defeated and sent to the monastery of Chelles, Seine-et-Marne. "Karlus maiorum domus filius Pippini quondam" donated property "villa Clippiacum in pago Parisiaco" to the abbey of St Denis by charter dated 17 Sep 741, subscribed by "Radberti comitis, Raygaubaldi comitis, Salaconis comitis, matrone Sonechildis, Grifonis filii sui". 
Suanachildis died after 17 September 741. 
They had one (1) child: Grifo.
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