Who is Lanval from The Lais of Marie de France and what is their importance?

Lanval appears in Lanval. He is a worthy knight in the service of King Arthur. Lanval loyally does not complain when the king accidentally passes over him when rewarding his knights. He is also loyal to his fairy lover when the queen makes an advance to him, but he lets his temper flare when she insults him, which is almost his undoing. The fairy lover redeems him from his mistake, however, and takes him away to live with her.