Drizen Vollachia (ドライゼン・ヴォラキア) was the 76th Emperor of the Vollachia Empire. While not playing an active role in the main story as he had died more than 7 years before Subaru's arrival, Drizen made an appearance in Crimson Afterglow side story.
He burned to ash when the Yang Sword Vollachia didn't recognise him as someone fit to rule the Holy Empire of Vollachia. His death sprung forth the Imperial Selection Ceremony.
Drizen was an old man with white hair, skin that had an unhealthy white pallour to it and a skinny figure that typified his old age. However, despite his old age, his eyes were still chock-full of ambition.
Some time ago, Drizen Vollachia was born during the Imperial Selection Ceremony, along with other kids born all around the Vollachia Empire. Eventually, Drizen had shown to be victorious, and had won the Selection.
Some time later, he had 67 children including Prisca Benedict and Vincent Abellux left all of them around the country to participate in the new Imperial Selection Ceremony. The ceremony started after the Yang Sword incinerated him, not recognizing him to be fit for an Emperor anymore.