Awdl
In early Welsh literature, an awdl was any long poem on a single end-rhyme (the word is the same as 'odl', 'rhyme'). Such early awdlau are associated with the Cynfeirdd such as Aneirin and Taliesin, and the poetry is found in manuscripts such as the Book of Taliesin, the Black Book of Carmarthen, the Hendregadredd Manuscript or The Red Book of Hergest.