Seadna
Quick answer: Seadna is an Irish bardic quatrain alternating eight and seven syllable lines with two-syllable and one-syllable endings. Learn the rules and how to try it.
Among the quatrain forms of the Irish bardic schools, seadna (roughly 'SHAY-nah'; the name is also spelled séadna or seadhna) has a distinctive gait. Where its siblings keep every line the same length, seadna alternates: a longer line, then a shorter one, a stride and a step, through every stanza. The form belongs to dán díreach, the strict professional verse of Ireland from about the twelfth to the seventeenth century, composed by trained filí for patrons who paid in cattle, land, and protection.
The alternation is not just of syllable counts but of endings. The long lines close on two-syllable words, the short lines on one-syllable words, so the stanza rocks between a falling close and a firm one. That built-in rhythm made seadna a favoured vehicle for song-like religious and praise poetry, and it survives in anthologies of bardic verse alongside deibhidhe and the rannaigheacht forms.
The rules of seadna
The stanza is a quatrain. Lines one and three carry eight syllables and end on two-syllable words; lines two and four carry seven syllables and end on one-syllable words. The main end-rhyme binds lines two and four. Strict practice, as with all dán díreach, layers on more: alliteration within lines, internal cross-rhymes between the couplets, agreement of consonant classes where full rhyme is not required, and the final word of line four alliterating with the preceding stressed word. The poem ends with dúnadh, circling back to its opening word or syllable.
Handbooks differ over the finer ornaments, some requiring the end of line one to rhyme inside line two, others treating that as refinement rather than law. Variants named seadna mor and seadna meadhonach adjust the ending word-lengths. If you write one in English, choose your ruleset and hold it consistently; the alternating counts and endings are the non-negotiable core.
Writing seadna in English
Let the alternation do the singing. Draft your argument first in plain quatrains of 8-7-8-7, ending long lines on disyllables ('water', 'ember', 'harbour') and short lines on strong monosyllables ('salt', 'flame', 'home'). The falling two-syllable endings should feel like an intake of breath that the monosyllable answers; read each couplet aloud to check the rock and settle. Then rhyme lines two and four, add one alliterative pair per line, and choose an opening word you can return to. English hymn meter, 8-7-8-7, is a helpful cousin: seadna will feel familiar to anyone who has sung 'Love Divine, All Loves Excelling', though the bardic sound-ornament asks far more of the line's interior.
Where it shines, and how it goes wrong
The rocking movement suits prayer, blessing, lament, and lullaby, anything meant to be said aloud over someone. Bardic poets used it for religious verse and formal praise, and its song-like swing survives translation better than most dán díreach effects. The characteristic beginner failure is ignoring the ending-shape rule and letting long lines close on monosyllables, which flattens the alternation into ordinary ballad meter. The two-syllable endings are the form's heartbeat; guard them. A second, subtler fault is choosing disyllables with the stress on the second syllable ('delay', 'beyond'), which break the falling cadence, so favour trochee-shaped words: 'harbour', 'shelter', 'winter'.
What poets can take from this
- Bank trochee-shaped disyllables ('shelter', 'ember') for the long-line endings.
- End short lines on your strongest monosyllabic nouns and verbs.
- Rhyme lines two and four first; add interior ornament afterwards.
- Read each couplet aloud for the stride-and-step rock the form wants.
- Use the 8-7-8-7 hymn tradition as scaffolding, then thicken the sound.
- Plan the dúnadh before drafting so the circle closes naturally.
Try it yourself
Write a seadna of two quatrains as a blessing spoken over a sleeping child or animal, long lines ending on soft two-syllable words, short lines on firm single syllables, and the whole poem returning at its close to the word it began with.
Questions
What is seadna in Irish poetry?
Seadna is a quatrain form of the Irish bardic dán díreach tradition. Lines one and three have eight syllables and end on two-syllable words; lines two and four have seven syllables, end on one-syllable words, and carry the main rhyme.
How does seadna differ from rannaigheacht mhor?
Rannaigheacht mhor uses four equal seven-syllable lines all ending on monosyllables, while seadna alternates eight- and seven-syllable lines with two-syllable and one-syllable endings, giving it a rocking, song-like movement the other form lacks.
Is seadna related to the story Séadna by Peadar Ua Laoghaire?
Only by name. Ua Laoghaire's 1904 novel Séadna, a landmark of modern Irish prose, takes its title from its main character. The verse form seadna is centuries older and belongs to the bardic metrical tradition.
By the Writory editorial team, reviewed by working poets. Updated July 2026.
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