Skuld was a princess of Scandinavian legend who married Heoroweard and encouraged him to kill Hroðulf (Hrólfr Kraki) in Hrólfs saga kraka.
Hrólfs saga kraka tells that one Yule, Helgi (appears as Halga in Beowulf) was visited by an ugly being while he was in his hunting house.
Under the pretext that they would wait three years before paying the accumulated tribute at one time, Skuld assembled a large army which included strong warriors, criminals, elves and norns.
A battle ensued and, in the account found in Gesta Danorum, Bödvar Bjarki fought in the shape of a spirit bear until he was awakened by Hjalti.
To overcome him, Skuld cast the most powerful spell to resuscitate her fallen warriors and after a long fight Hrólfr and all his eleven champions fell, with the sole exception of Vöggr who promises to avenge the king.
They seized the wicked elf queen by surprise, just as she had suddenly attacked the king, tying her arms so she could not use her magic arts.
Yrsa and Adillus married their Scullda to Hiørvardus, the King of Öland (also called Hiorvardus and Hevardus, and who corresponds to Heoroweard in Beowulf).
As her half-brother Rolfo (Hrólfr Kraki, Hroðulf) was not consulted about this marriage, he was infuriated and he attacked Öland and made Hiørvardus and his kingdom tributary to Denmark.
They were well-received, but after the banquet, when most people were drunk asleep, the Swedes and the Goths (i.e. the Geats) proceeded to kill everyone at Roluo's residence.
Name spellings are derived from Oliver Elton's 1905 translation, The First Nine Books of the Danish History of Saxo Grammaticus, via Wikisource.