It is the Italian author and poet Boccaccio who makes the decisive shift in the character's name in "Il Filostrato". This poem is the first work dedicated to telling the story of the love triangle rather than to the larger tale of the Trojan War. Geoffrey Chaucer's "Troilus and Criseyde" is an expanded version of the story based on Boccaccio. Several other authors then took up the tale, including the Scottish poet Robert Henryson in his "The Testament of Cresseid", which 'completes' Cressida's story (left unfinished by Chaucer), and William Shakespeare in his play of the Trojan War, "Troilus and Cressida".