Astolat

When the knight was able to ride, he went back to Astolat with Elaine and Lavaine.

He rides to Astolat—“that is, Gylford”—where Arthur sees him.

Had he not read aloud to her only a fortnight before the story of Launcelot and the lily maid of Astolat?

I will take the adventure as it comes,' and early next morning he rode away till at eventide he reached Astolat.

Elaine is called "the lily maid of Astolat" (Guildford), and knowing that Launcelot was pledged to celibacy, she pined and died.