Geirlug The King's Daughter is an Icelandic fairy tale collected in Neuisländischen Volksmärchen.
The dragon flew on to a neighboring kingdom, where it tried to seize a baby princess, but there the king struck it with such a blow that it dropped the prince.
She transported them magically, and told him to bind a band with golden letters about his forehead and to not drink before he had spoken to his father But on the way, it seemed to grow much longer, and it grew hot, and he became so thirsty that he drank from a stream and forgot Geirlug.
Geirlug realized what had happened and went to work for a forester, to sweep and tend cows.
She told him to tie the calf for her, but the rope caught him and he could not get free until morning, at which he left her as a witch.
On their return, a carriage was sent, but no horse; Grethari got an ox to pull it from a young woman who demanded three seats at the wedding, for her and her friends.