Swanachild (also Swanahild or Serenahilt) was the second wife of Charles Martel.
Her parents could be Tassilo II, duke of Bavaria, and his wife Imma.
[citation needed] In the 720s Charles Martel married Swanachild.
After an initial conflict, Martel established amicable relations with Bavaria.
After the death of Martel, she supported her son's failed attempt to gain a portion of his inheritance.