Thiadsvind also known as Theudesinda or Theodelinda (677 - ?) was the daughter of Redbad, King of the Frisians. In 711 she was married to Grimoald the Younger the eldest son of Pepin of Herstal. The marriage was officiated by archbishopric or bishopric of the Frisians Willibrord. They had two sons: Theudoald and Arnold.
References
Thiadsvind Wikipedia(Text) CC BY-SA