Awdl

In early Welsh literature, an awdl () is any long poem on a single end-rhyme (the word is the same as "odl", "rhyme"), using cynghanedd. 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".
History.
"Awdlau" in the early period are to be distinguished from "Englynion", which are short, three or four-line stanzas. Since the recorded beginnings, "awdlau" were highly ornamental, and the forms permitted became stricter and stricter until the high Middle Ages. The 11th –13th centuries saw the royal court poets (Poets of the Princes) develop the art to a remarkable level of skill and accomplishment. After the extinction of Welsh royalty with the death of Llywelyn ap Gruffudd in 1282, standardisation and codification of the rules of professional poetry led to recognition of 24 strict metres, each of which must use "cynghanedd". By this period, the "englyn" metres as well as the "cywydd" metres were included within the 24, and the term "awdl" "simpliciter" became used for any long poem composed in metres chosen from the permitted range, with end-rhyme staying constant within individual sections of the poem. Among those known to have used the form in the early 17th century was Dafydd Llwyd Mathau in 1611.
Prestige.
Such poems are judged to be among the finest work a poet can aim to produce. Prizes are given at "eisteddfodau" for the best "awdl", the most lauded being that of Chair at the National Eisteddfod of Wales, held each year in August. While 19th-century "awdlau" could run to thousands of lines, it is unusual to find such extensive pieces these days; the National Eisteddfod limits competitors to a few hundred lines.
Perhaps the best known "awdl" is an apocalyptic elegy by Gruffudd ab yr Ynad Coch, marking the death in 1282 of Llywelyn ap Gruffudd. A famous early 20th-century example is "Yr Arwr", by Hedd Wyn.