Siggeir is the king of Gautland (i.e. Götaland/Geatland, but in some translations also rendered as Gothland), in the Volsunga saga. He had a brother named Sigmund who was the father of Sigar, another villainous king who killed the hero Hagbard.

Siggeir married Signy, the sister of Sigmund (a different Sigmund) and the daughter of king Völsung. At the banquet Odin appears in disguise wearing a cape and a hood and sticks a sword in the tree Branstock. Then he said that whoever managed to pull the sword out could keep it. Siggeir and everone else tried but only Sigmund succeeded. Siggeir was offended and wanted revenge.

Consequently, Siggeir invited Sigmund, his father Völsung and Sigmund's nine brothers to a visit in Gautland to see the newlyweds three months later. When the Völsung clan had arrived they were attacked by the Gauts (Geats) and king Völsung was killed and his sons captured.

Signy beseached her husband to spare her brothers and to put them in stocks instead of killing them. As Siggeir thought that the brothers deserved to be tortured before they were killed, he agreed.

He then let his shape-shifting mother turn into a wolf and each night devour one of the brothers, until only Sigmund remained. Signy had a servant smear honey on the face of Sigmund and when the she-wolf arrived she started licking the honey off Sigmund's face. She licked and stuck her tongue into Sigmund's mouth whereupon Sigmund bit her tongue off, killing her. Sigmund then hid in the forests of Gautland and Signy brought him everything he needed.

Signy gave Siggeir two sons and when the oldest one was ten years old, she sent him to Sigmund to train him to avenge the Völsungs. The boy did not stand a test of courage so Signy asked Sigmund to kill her worthless son. The same thing happened to Siggeir's second son.

Signy and her brother committed incest and had the son Sinfjotli. After some adventures Sigmund and Sinfjotli kill Siggeir.

See also:king of the Geats