Quatern. A Quatern is a sixteen line French form composed of four quatrains. It is similar to the Kyrielle and the Retourne. It has a refrain that is in a different place in each quatrain.
A Kyrielle is a French form of rhyming poetry written in quatrains (a stanza consisting of 4 lines), and each quatrain contains a repeating line or phrase as a refrain (usually appearing as the last line of each stanza).