Swanachild (alsoSwanahild orSerenahilt) was the second wife ofCharles Martel.

Swanachild belonged to the clan of theAgilolfing, though her parentage is not quite clear. Her parents could beTassilo II,duke of Bavaria, and his wife Imma. Alternatively, her parents could beTheudebert of Bavaria, duke of Bavaria and his wifeRegintrud.^{[citation needed]}

In the 720sCharles Martel married Swanachild. After an initial conflict, Martel established amicable relations withBavaria.^[1]

TheReichenau Codex listed her asSuanahil regina.^{[citation needed]}

With Martel she had one child,Grifo. After the death of Martel, she supported her son's failed attempt to gain a portion of his inheritance. This she did with the support of her uncleOdilo of Bavaria. Afterwards she was relegated to the position of abbess ofChelles Abbey.

• 8th-century deaths
• 8th-century Frankish women
• 8th-century Frankish people
• People of medieval Bavaria
• Charles Martel

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• Year of birth missing