[1][2] The origin of the sonnet form has been traced to poems by Giacomo da Lentini in Sicily.
"Solid Determination to Ultimate Goals" — Srasimum's Sestet by Nicola A. Viriditch Early Italian sonnets, and in particular those of Dante, often close with the rhyme arrangement ABCCBA, 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.
Another form of sestet has only two rhymes, ABABAB, as is the case in Gray's famous sonnet On the Death of Richard West.
As a rule, with the octave having been more or less objective, reflection should make its appearance in the sestet, with a tendency to the subjective manner.
The French sonneteers of the 16th century, with Ronsard at their head, preferred the softer sound of the arrangement AABCCB.