This means, Morniemacar, king of Arorg. He is the king of the realm of Arorg where the arorgoth live. They are the last shade of the afar (in time) kingdom of Arorgoel. This kingdom was attacked by the 20 darklords of Scarloth, then, almost everything died. For the next almost 150 years, the land of Eroel (where the kingdom of Arorgoel was) was ruled by Oroleth, the last darklord. (the others died in a battle against the mighty faeries, the Khor battle). Morniemacar is not his real name, I don't know it unfortunately (no one knows it).