sestet

A sestet is the name given to the second division of an Italian sonnet (as opposed to an English or Spenserian Sonnet), which must consist of an octave, of eight lines, succeeded by a sestet, of six lines.

The first documented user of this poetical form was the Italian poet, Petrarch. In the usual course the rhymes are arranged abc abc, but this is not necessary. Early Italian sonnets, and in particular those of Dante, often close with the rhyme-arrangement abc cba; but in languages where the sonority of syllables is not so great as it is in Italian, it is incorrect to leave a period of five lines between one rhyme and another. In the quatorzain, there is, properly speaking, no sestet, but a quatrain followed by a couplet, as in the case of English Sonnets. Another form of sestet has only two rhymes, ab ab I ab; as is the case in Gray's famous sonnet On the Death of Richard West.