The king of Lorgan.
He wanted to marry Queen Tydomie of Karmerie – a match which was sponsored by Tydomie’s uncle (and Libers’ brother-in-law), Malloas. When she refused, because of her love for Arthur’s nephew Meleranz, Libers invaded her lands.
He was defeated by Meleranz, who arranged a marriage between Libers and Queen Dulceflur, Tydomie’s cousin.
Source
Meleranz | Der Pleier, 1240-1270