The author of the french poem chanson de est?

You're likely thinking of "Chanson de geste" (Song of Deeds), which is not a specific poem but a genre of medieval French epic poetry.

There is no single author for the Chanson de geste. These poems were typically written by anonymous authors or a group of writers.

Some of the most famous Chansons de geste include:

* The Song of Roland (La Chanson de Roland): A classic example of the genre.

* The Song of Guillaume (La Chanson de Guillaume): Another well-known epic.

* The Song of the Cid (Cantar de mio Cid): Though written in Spanish, it shares many similarities with the Chansons de geste.

Let me know if you have any other questions about medieval French literature!