Who Invented the Sestet?

The first recognized and documented user of this poetical form was the Italian poet Petrarch

Petrarch
Petrarch spent the later part of his life journeying through northern Italy as an international scholar and poet-diplomat. His career in the Church did not allow him to marry, but he is believed to have fathered two children by a woman or women unknown to posterity.
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Who is the father founder of sonnet?

Petrarch, Father of the Sonnet | Folger Shakespeare Library.

Who invented the quatrain poem?

Shairi (also known as Rustavelian Quatrain), a verse form of four 16-syllable lines rhyming A-A-A-A invented by Georgian poet Shota Rustaveli. The Shichigon-zekku form used in Chinese and Japanese poetry. Both rhyme and rhythm are key elements, although the former is not restricted to falling at the end of the phrase.

Alexander Ross

Alexander Ross

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Alexander Ross has covered the video game industry for a decade, writing deep dives on game design, esports tournaments, VR developments, and gaming culture.