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Gwawdodyn Hir is a Welsh meter based on sixains (six-line stanzas). It combines lines of nine and ten syllables, utilizing rhyme and cross-rhyme to enforce rhythm. Superficially, it is an expanded version of the Gwawdodyn Byr, taking that same form and adding two more lines to it.
Trian Rannaigechta Moire is an ancient Celtic poem form that prizes rhymes and consonance. The form is comprised entirely of quatrains that have an internal xABA rhyme structure, in which ‘B’ will correspond to a syllable in the middle of the last line if certain conditions are met.
Gwawdodyn Byr is a Welsh meter based on quatrains that is nearly, but not quite, isosyllabic. It features two nine-syllable lines followed by two ten-syllable lines, with a single rhyme sound that appears on all four lines. The sound appears at the end of lines one, two, and four, but in the middle of line three.