User blog comment:B214/High School DxD EX/@comment-50.139.232.230-20150907175237/@comment-16281343-20150910162913

"Galatine is the sister-sword of Excalibur given to Gawain by the Lady of Lake. Referred to as the "shadow to Excalibur's light", the sword was hidden away in the shadow of Excalibur, so there aren't many mentions of it."