The African prince of Namur.
He killed his neighbor, King Amire of Libya, because he coveted Amire’s wife, Lamire (Liamere). Lamire died of heartbreak, however, leaving Lion in misery.
Meanwhile, word of his deed reached King Wigalois of Korntin, the son of Gawain and relative (through his wife) of Lamire. Wigalois raised an army and met Lion in battle. Lion was killed by Gawain.
Source
Wigalois | Wirnt von Grafenberg, early 13th century