[13] It was suggested by Thomas Parry that the poem was written during Lleucu's lifetime as a fictitious elegy,[8] though Rachel Bromwich felt that its expression of passionate and apparently spontaneous grief made this unlikely.
[16][17] The form of Llywelyn's poem, addressed to his dead lover, is clearly modelled on that of the serenade which was in common use in the Middle Ages as a wooing technique, doubtless as much in 14th-century Wales as anywhere else.
[19][20] Rachel Bromwich also saw in the poem's unrestrained, exclamatory reproaches to the beloved "for her silence, and for breaking troth with her lover by her death" a parallel with the traditional Irish keen.
[21] Llywelyn may have drawn on his knowledge of Welsh legend for a line in which he compares Lleucu to that "measure of maidens, Indeg",[22] a concubine of King Arthur whose story has not survived.
[23] "Lament for Lleucu Llwyd" began a new genre of Welsh poem, the woman's elegy in cywydd form, of which examples can be found in the work of Dafydd Nanmor and Bedo Brwynllys in the 15th century, and Wiliam Llŷn in the 16th.