The answer to "Who is the god of death?" depends on the mythology or belief system you're referring to. There isn't one singular god of death across all cultures. Many cultures have their own deities associated with death, the underworld, or the transition between life and death.
Prominent Examples of Death Deities:
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Hades (Greek Mythology): In ancient Greek religion and mythology, Hades is the god of the dead and king of the underworld. His name even became synonymous with the underworld itself. He was the eldest son of Cronus and Rhea. [Reference: Hā́idēs, Attic Greek: [háːi̯dεːs], later [háːdεːs]), in the ancient Greek religion and mythology, is the god of the dead and the king of the underworld, with which his name became synonymous. Hades was the eldest son of Cronus and Rhea, although this also made him the last son to be regurgitated by his father.]
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Yama (Hinduism): Yama is the Hindu god of death and the guardian of the South, the cardinal direction associated with death and the underworld. [Reference: Yama the Hindu God of Death | Roles, Genealogy & Art Depictions ...]
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Other Deities: Numerous other cultures have their own gods of death. A Wikipedia list details many of these, including Owuo (Akan god of death and destruction) and Asase Yaa (Akan goddess partially associated with barren places and death). [Reference: List of death deities - Wikipedia]
Considerations:
The concept of a "god of death" can also vary greatly. Some deities preside over the underworld, judge souls, or guide the deceased, without necessarily being considered solely "gods of death." Others are more directly involved in causing death or representing its destructive power. The specific role and characteristics of such a deity differ significantly based on cultural context.
For example, in some belief systems, death isn't necessarily controlled by a single god but is part of a natural cycle or the will of a higher power. [Reference: Why Does God Let People Die? — Hope Radio KCMI 97.1 | Cross ...]
Conclusion
The question of "who is the god of death" has diverse answers depending on the specific mythology being considered. There isn't a single, universally accepted answer.