Beelzebub is a prominent deity in the Philistine Pantheon and Abrahamic Pantheon. He is known by various titles. To the Humans, he is commonly known as the "Lord of the Flies". To the Gods, he is sometimes known as "Anathema", which indicates he is the one cursed by Satan.

He also bears other titles such as the "Priest of Gluttony", the "Ruler of Evil Spirits", the "God of Darkness" and he is worshipped by the Canaanites as "Baal-Zebul".

(Source: Shuumatsu no Valkyrie: Record of Ragnarok Wiki)