In the Ragnelle romance, Gyngolyn appears near the end of a story centred on his parents. King Arthur faces a challenge from Gromer Somer Joure and must discover what women most desire. Ragnelle supplies the answer, sovereignty, in exchange for marriage to Gawain. On their wedding night Gawain lets her choose for herself, breaking the enchantment that has distorted her appearance. The poem names their son Gyngolyn as a good knight of the Round Table. It says Ragnelle lives with Gawain for five years; it does not narrate Gyngolyn's childhood or his own adventures.

The longer Fair Unknown romances begin elsewhere. In the Middle English Libeaus Desconus, also spelled Lybeaus Desconus, the youth is raised away from court by an unnamed mother. He takes armour from a dead knight and seeks knighthood from Arthur without being able to supply the identity expected of a noble warrior. A messenger brings a request to rescue her mistress, and the young knight wins the assignment despite doubts about his experience. Renaut's French version calls the messenger Helie and her mistress Blonde Esmeree. Its hero is Guinglain, son of Gawain and Blanchemal, rather than an explicitly identified son of Ragnelle.

The French rescue journey leads through armed opponents and enchantment. At the Golden Isle, Guinglain becomes involved with the Maiden with the White Hands before continuing towards Blonde Esmeree's imprisoned court. The queen has been transformed into a serpent by enchanters. Her kiss releases her from that shape, and a disembodied voice reveals the rescuer's name and parentage. The corresponding English episode concerns the Lady of Synadoun, who approaches in dragon-like form. The enchanted woman initiates the kiss: the scene should not automatically be retold as a deliberate decision by the knight to show mercy instead of striking.

Renaut continues beyond the rescue. Guinglain returns to the Maiden with the White Hands, who reveals that she was the voice that named him. He later leaves her for a tournament despite knowing that departure will cost him her love. Arthur encourages his marriage to Blonde Esmeree, bringing him a kingdom but not resolving his longing for the other woman. The Middle English romance does not reproduce this whole second sequence; some manuscripts instead emphasise recognition by his parents. The German Wigalois belongs to the wider family of related romances, not an interchangeable account of every event in Gyngolyn's life.

Malory names Gingalin among Gawain's sons and later includes Gingaline among the knights recruited by Agravain and Mordred at Carlisle. They attempt to catch Lancelot with Queen Guinevere. Lancelot goes to her without armour, although the text says he carries his sword; he kills Colgrevance, takes his armour and fights his way past the other attackers. Gingaline is among those killed, while Mordred escapes. This is a separate textual appearance, not a documented sequel to the Ragnelle marriage or the French serpent adventure. Keeping the versions distinct preserves both the promise and the darker possibilities attached to Gawain's son.