Yamaraja (Sanskrit: यमराज, Yamaraja), also known as Yama (Sanskrit: यम, Yama), Yan Mo, Yan Mo, Yan Luo Wang, Yan Luo Da Wang, Ye Mo, Ye Mo Tian Wang, Yan Mo, Yan Mo. In Hindu mythology, a deity who, together with the Chytra Gupta, is in charge of death and the judgment of the dead, equivalent to Hades in Greek mythology and Osiris in Egyptian mythology.
In the Rigveda, he was the first human to experience death and thus mastered the power of death. Later, he became a deity residing in the heavenly realm, in charge of the night sky, and Mahayana Buddhism listed him as one of the twelve heavens. With the introduction of Buddhism to China, he was considered the deity in charge of the punishment of hell, that is, the King of Hell.
According to the records of the Vedas, Yama was the first mortal to die and reach the paradise of the heavenly realm. Therefore, he became the ruler of the undead, guiding their souls to reach the heavenly realm. But in later records, Puma gradually became known as the god of death. He is also considered the guardian deity of the South, in charge of justice and law.
His sister is Yan Mi, and together with his brother, she is considered one of the earliest men and women in the world. In the Rigveda, it is recorded that Yan Mi requested to marry her brother and reproduce offspring, but Yan Mo believed it was incest between siblings and refused.

He lives underground, and the capital is called Yanmo City. There are two dogs guarding the road in front of his palace, each with four eyes, wide nostrils, and insatiable greed. They act as his messengers and roam the world, passing orders to their masters.

In the epic, his image becomes very terrifying: green face, red clothes, riding a water buffalo, holding a heavy hammer in one hand, and a lasso that captures the souls of the deceased in the other.
After the death of a person, the soul comes to Yan Mo, and Yan Mo's ministers report the merits and sins of the deceased during their lifetime based on records. Yan Mo then judges that the soul of the deceased should ascend to the ancestral world in heaven, either descend to the 21st level of hell, or be reincarnated into the human world.
He also has many other titles, such as "Death God", "Ghost King", "Lord of Ancestral Spirits", "Dharma King", "Wand bearer", "Lasso bearer", and so on. The image of Yan Mo was later spread to the Chinese people through the flow of Buddhist scriptures, known as the "King of Yan Luo" or "King of Yan".

The origin of Yan Mo in ancient India can be traced back to at least around 2000 BC. In Iranian mythology, this deity has already appeared.
At that time, ancient Indians had already begun to develop in the northern region of India, where the caste system of Vedic culture began, and the Vedic period in Indian history was established. The White Indians used languages earlier than Sanskrit to write the Vedic scriptures, with the earliest being the Rigveda.
The ancient Indian Brahmins developed into the predecessor of modern Hinduism, Brahmanism, in northwest India. The Vedas are a classic of Brahmanism, so the beliefs of the demons have been inherited and changed in Brahmanism. Brahmanism believes in reincarnation and believes that Yan Mo was the first person to die in legend. Later, the Yan Demon God transitioned from the Heavenly Realm to the Earthly Realm, and was considered a deity specialized in supervising the behavior of the deceased during their lifetime and providing rewards and punishments; In the eyes of ancient white Indians, Yan Mo was a friendly god of death, not a terrifying deity. Yan Mo will personally lead the deceased through the obstacles to reach the underworld. After reaching the underworld, Yan Mo will also enjoy a feast with the undead.
But with the complete domination of the ancient Indian Brahmins over the Indian subcontinent, the Brahmins living at the highest level in the entire society, in order to consolidate their caste system and ruling position, and to be vigilant against people's crimes, depicted Yan Mo as the ruler of the dead and all the gods of death, from a kind ruler of the dead, that is, the ruler of hell, with many subordinates. Yan Mo also became a terrifying deity who would torture the unworthy dead with various forms of torture. This practice has aroused people's fear of the deity Yan Mo, and with the spread of Buddhism and ancient Brahmanic culture, it has spread to the hearts of Chinese people.