A sestina is a fixed verse form consisting of six stanzas of six lines each, normally followed by a three-line envoi. The words that end each line of the first stanza are used as line endings in each of the following stanzas, rotated in a set pattern.
The Occitan troubadour Arnaut Daniel, considered the originator of the sestina
Arnaut Daniel was an Occitan troubadour of the 12th century, praised by Dante as "the best smith" and called a "grand master of love" by Petrarch. In the 20th century he was lauded by Ezra Pound in The Spirit of Romance (1910) as the greatest poet to have ever lived.
Arnaut Daniel