Crystal DragonCrystal Dragon.

Crystal Dragon (Japanese: クリスタル☆ドラゴン, Hepburn: Kurisutaru Doragon) is a Japanese historical fantasy manga series written and illustrated by Yuuho Ashibe. Set in Ireland and Roman Britain, the story follows a black-haired girl named Arianrhod and her fight against Balor Evil-Eye, the Gothic warlord who destroyed her home tribe. Joining her in the fight are Henruda, the daughter of a Celtic chieftain, and Legion, the Silver Knight.