It is seen from the above that the Petrarchan sonnet , or the Italian sonnet as it is also
called has an octave as the first unit and a sestet as the second unit. The octave
develops one thought . Then there is a turn or volta. The sestet grows out of the
octave , varies it completes it.
The sonnet came into English in the 16th century , the earliest sonneteers being
Thomas Wyatt and Earl of Surrey.