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Sigebert I ( 535 - 575) was a Frankish King, one of the sons of Clotaire I and Ingund.
When Clotaire I died in 561, his kingdom was divided, in accordance with Frankish custom, among his four sons; Sigebert became king of the northeastern portion, known as Austrasia, to which he added further territory on the death of his brother, Charibert, in 567 or 568.
But at Sigebert's moment of triumph, when he had just been declared king by Chilperic's subjects at Vitry, he was struck down by two assassins working for Fredegund.