While Geoffrey Chaucer was heavily influenced by Italian literature, he lived in the 14th century, while the Italian Renaissance, which produced the greatest Italian writers, came later. So, the three contemporary great Italian writers who influenced Chaucer are:
* Dante Alighieri (1265-1321): Dante's *Divine Comedy* was a major influence on Chaucer's *Canterbury Tales*. Both poems use a framework story to tell various tales, and both explore themes of morality, religion, and the human condition.
* Giovanni Boccaccio (1313-1375): Chaucer's *The Canterbury Tales* draws heavily on Boccaccio's *Decameron*, which also uses a framework narrative to tell stories. Chaucer borrowed several plots and characters from the *Decameron*, and its bawdy humor is also evident in his work.
* Francesco Petrarca (1304-1374): Though not directly influential on *The Canterbury Tales*, Petrarch's poetry influenced Chaucer's own love poems and his use of the Italian language in his works.
It's important to note that while Chaucer was influenced by these earlier writers, his own work stands apart as a unique and influential contribution to English literature.