It is noted in recent scholarship as an early example of tale type ATU 510A, 'Cinderella', of the international Aarne–Thompson–Uther Index.
[1] Kalinke and Mitchell summarise the saga thus: Gullbrá and Sóley are twin daughters of the king of Hólmgarðaríki.
To avoid marrying the disagreeable Úlfr, Sóley promises to marry the ugly slave Kolr, but changes shapes with another woman.
The able but naive Vilmundr, son of a man named Sviði, comes upon Gullbrá while seeking a lost goat.
They overcome various attackers, among them a herd of pigs.