アロウン

The Great Demon King, he was sealed away for 1000 years after his mortal body dies on the battlefield. Drwc resurrected him using Riannon as living sacrifice, but is instead killed after Arawn saves Riannon from mind control. She takes a liking to him instantly, and makes him chieftain of the Gael Tribe. Arawn's true name, a name that awakens his power is Lucifer. He was the 13th Angel born after the previous 12 and was thought to be an imperfection. He became one of the 12 Angels after his "father" Angel, Myrddin died by performing the Song of Creation. He assumed role of his "father", opposed the remaining 11 White Angels, thus leading him to be exiled from Heaven, and became a Fallen Angel./

From url=http://en.wikipedia.org/wiki/List_of_Tears_to_Tiara_characters#Arawn