After the period of the chanson de geste was over, the Matter of France lived on.
From the en.wikipedia.org
The roman courtois is distinguished from the chanson de geste not only by its subject matter, but also by its emphasis on love and chivalry rather than acts of war.
From the en.wikipedia.org
Poetry flourished, however, in the hands of the troubadours, whose courtly romances and chanson de geste amused and entertained the upper classes who were their patrons.