Terza rima

Terza rima (, , ) is a rhyming verse stanza form that consists of an interlocking three-line rhyme scheme. It was first used by the Italian poet Dante Alighieri.
Form.
The literal translation of "terza rima" from Italian is "third rhyme". "Terza rima" is a three-line stanza using chain rhyme in the pattern ABA BCB CDC DED. There is no limit to the number of lines, but poems or sections of poems written in "terza rima" end with either a single line or couplet repeating the rhyme of the middle line of the final tercet. The two possible endings for the example above are DED E, or DED EE. There is no set rhythm for "terza rima", but in English, iambic pentameter is generally preferred.
History.
The first known use of "terza rima" is in Dante's "Divine Comedy", completed in 1320. In creating the form, Dante may have been influenced by the sirventes, a lyric poetry form used by the Provençal troubadours. Inspired by Dante, other Italian poets, including Petrarch and Boccaccio, began using the form.
The first English poet to write in "terza rima" was Geoffrey Chaucer, who used it for his "Complaint to His Lady". Although a difficult form to use in English because of the relative paucity of rhyme words available in a language which has, in comparison with Italian, a more complex phonology, "terza rima" has been used by Thomas Wyatt, John Milton, Lord Byron (in "The Prophecy of Dante") and Percy Bysshe Shelley (in his "Ode to the West Wind" and "The Triumph of Life"). Thomas Hardy also used the form in "Friends Beyond" to interlink the characters and continue the flow of the poem. A number of 20th-century poets also employed the form. These include W. H. Auden, Andrew Cannon, T. S. Eliot, Robert Frost, Elizabeth Jennings, Philip Larkin, Archibald MacLeish, James Merrill, Jacqueline Osherow, Gjertrud Schnackenberg, Clark Ashton Smith, Derek Walcott, Richard Wilbur and William Carlos Williams. Edward Lowbury's adaptation of the form to six-syllable lines has been named "piccola terza rima".
The form has also been used in translations of the "Divine Comedy", including Robert Pinsky's version of the "Inferno", and Laurence Binyon's, Dorothy L. Sayers's and Peter Dale's versions of the entire work.
Examples.
The opening lines of the "Divine Comedy":
A section from Shelley's "Ode to the West Wind" with a couplet ending: