Metre (poetry) of over some two-and-a-half millennia. Beginning with the earlier recorded forms: the Classic of Poetry tends toward couplets of four-character lines, grouped in rhymed quatrains; and, the Chuci follows this to some extent, but moves toward variations in line length. Han Dynasty poetry tended towards the variable line-length forms of the folk ballads and the Music Bureau yuefu. Jian'an poetry, Six Dynasties poetry, and Tang Dynasty poetry tend towards a poetic metre based on fixed-length lines of five, seven, (or, more rarely six) characters/verbal units tended to predominate, generally in couplet/quatrain-based forms, of various total verse lengths. The Song poetry
Viriato Trágico (poem) The poem, like many other epic works of 17th-century Portuguese literature, is written in ottava rima ("oitava rima" in Portuguese). This eight-line stanza of Italian origin is composed of hendecasyllabic lines rhymed "abababcc". The form was introduced into epic poetry by Giovanni Boccaccio in the 14th century. Soon it became very popular in Italy. In the beginning of the 16th century Francisco de Sá de Miranda, returning home from a stay in Italy, imported it into Portuguese poetry. This stanza was chosen by Luís de Camões for his "Lusiads". Many other poets used this form in the 17th century, including