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.
Rannaicheacht Mhor is an ancient Irish poem form based entirely on quatrains. The lines of the quatrain are isosyllabic, a relative rarity among Irish poem forms, and cross-rhymes are used liberally. In particular, every line includes a word that matches the end rhyme in its paired line.
Deibide baise fri toin is an asymmetrical Irish verse form that uses quatrains divided up into syllable counts of 3/7/7/1, in which each number represents a different line’s length. This results in a poem that feels oddly stilted both when read and when spoken, though this is arguably part of the charm of the form.
Cethramtu rannaigechta moire is an Irish verse form in which each line has exactly three syllables and each stanza has four lines. The second and fourth lines of each stanza rhyme and the poem may consist of any number of four-line stanzas (quatrains).
Awdl gywydd is a verse form from Ireland that consists of rhymed quatrains with interlocking couplets, connected by a unique rhyme scheme that ties the lines together with both internal rhymes and end rhymes. The lines are always seven syllables long and the poems can be any length in multiples of four lines.