Sestina
The sestina is an highly structured form of poetry, dating back to the 12th century. It consists of thirty-nine lines; six six-line stanzas ending with a triplet. There are no restrictions on line length.In the five stanzas following the first one which sets it up; the same six words must end the six lines, in a strictly prescribed variation of order. The words are then included within the lines of the concluding triplet (or tornada), again in a prescribed order.
The troubadour Arnaut Daniel is credited with having invented the sestina form.
