Rubaʿi the convention is sometimes extended so that the unrhymed line of the current stanza becomes the rhyme for the following stanza. The structure can be made cyclical by linking the unrhymed line of the final stanza back to the first stanza: ZZAZ. These more stringent systems were not, however, used by FitzGerald in his "Rubaiyat". Rubaʿi Rubāʿī (from "rubāʿiyy", plural "rubāʿiyāt") is the term for a quatrain, a poem or a verse of a poem consisting of four lines. It refers specifically to a form of Persian poetry, or its derivative form in English and other languages In classical Persian
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