[6][1] The poet addresses and praises a seagull flying over the waves, comparing it to, among other things, a gauntlet, a ship at anchor, a sea-lily, and a nun.
The academic critic Huw Meirion Edwards considered that "The Seagull"’s imagery goes far beyond anything that had come before it in Welsh poetry,[7] and Anthony Conran wrote that "pictorially it is superb…[it] has the visual completeness, brilliance and unity of a medieval illumination, a picture from a book of hours".
[9] The image of the seagull's beautiful, white, immaculate purity suggests that of the girl,[10] while the bird's flight embodies the idea of freedom, in contrast with the dominating and enclosing castle.
The translator Idris Bell explained the sense of this as "Have the kindness in courteous wise to give her the message that I shall die unless she will be mine.
"[17] Eigr, with whom Dafydd compares his beloved, was in Welsh tradition the wife of Uther Pendragon and mother of King Arthur.