Rajasuya also known as King's sacrifice is a Śrauta ritual of the Vedic religion. It is a ceremony that marks a consecration of a king. According to the Puranas, it refers to a great sacrifice performed by a Chakravarti - universal monarch, in which the tributary princes may also take part, at the time of his coronation, as a mark of his undisputed sovereigntyThe rajasuya is associated with the consecration of a king and is prescribed as a means to establish a king's sovereignty. It is described in the Taittiriya corpus, including Apastamba Srauta Sutra 18.8–25.22. It involves soma pressing, a chariot drive, the king shooting arrows from his bow, and a brief "cattle raid". The newly anointed king seizes cattle belonging to his relative, and then gives part of his property to that relative. There is a telling of the tale of Shunahshepa, a boy who was nearly sacrificed to Varuna on behalf of the sonless king Harishchandra. Also included is a game of throwing dice with the Adhvaryu priest in which the king wins a cow, by which the king is enthroned and the cosmos is regenerated. The Shatapatha Brahmana states that the rajasuya was the means by which a Kshatriya may become a king, and is not suitable for Brahmanas. Satyavati is the daughter of a fisherman chieftain, Daashraaj and was brought up as a commoner on the banks of the river Yamuna. Another legend says that she is the biological daughter of the Chedi king Uparichara Vasu (Vasu) and a cursed apsara (celestial nymph), who was turned into a fish called Adrika. Due to the smell emanating from her body, she was known as Matsyagandha ("She who smells like fish"), and helped her father, Dasharaja, in his job as a ferryman and fisherman.He had gone out hunting and while resting under a tree, he thought about his wife and ejaculated. Not wanting to waste his sperm, he packed them in a leaf and asked a parrot to deliver the packet to his wife. On his way, the parrot was attacked by a falcon and the semen dropped in the river Yamuna. A fish ate it. This fish was an Apsara called Adrika. In older times it was known that at night time, Apsaras used to come to the Yamuna river and enjoyed their time there. Humans avoided going to Yamuna at this hour because of them. Once an old Brahmin went to Yamuna to finish his evening ritual. Adrika was there enjoying her time with some Gandharvas. She did not like the presence of a human. She swam under water and pulled this Brahmin's leg. He instantly knew it was an apsara and cursed her to become a fish and stay in Yamuna. Since then, she has been staying in Yamuna in the form of a fish. Coming back to the story of Satyawati, the semen dropped by the parrot was consumed by Adrika and she had twins. A fisherman soon caught her in his net and when her belly was cut open, a human boy and girl were found. The children were presented to King Uparichara. He adopted the boy and named him Matsya. The girl was adopted by the chief of fisherfolk and she grew up as a fisherwoman. Her name was Satyawati, but because she smelled like a fish, she was also called Matsyagandha. Parashara When Parāśara's father, Sakti Maharishi died after being devoured by the king Kalmashapada along with Vashistha's other sons, Vashistha resorted to ending his life by suicide. Hence he jumped from Mount Meru but landed on soft cotton, he entered a forest fire only to remain unharmed, then he jumped into the ocean which saved him by casting him ashore. Then he jumped in the overflowing river Vipasa, which also left him ashore. Then he jumped into the river Haimavat, which fled in several directions from his fear and was named Satadru. Then when he returned to his asylum, he saw his daughter-in-law pregnant. When a son was born he acted as his father and hence forgot completely about destroying his life. Hence, the child was named Parāśara which meant enlivener of the dead.Birth of Vyasa and his past lifeAccording to Vishnu Purana, Vyasa was born on an island of the Yamuna at Kalpi.According to legend, in a previous life Vyasa was the Sage Apantaratamas, who was born when Lord Vishnu uttered the syllable "Bhu". He was a devotee of Lord Vishnu. Since birth, he already possessed the knowledge of the Vedas, the Dharmashastras and the Upanishads. At Vishnu's behest, he was reborn as Vyasa.Vyasa was the son of Sage Parashara and great grandson of Sage Vashistha. Prior to Vyasa's birth, Parashara had performed a severe penance to Lord Shiva. Shiva granted a boon that Parashara's son would be a Brahmarshi equal to Vashistha and would be famous for his knowledge. Parashara begot Vyasa with Satyavati. She conceived and immediately gave birth to Vyasa. Vyasa became an adult and left, promising his mother that he would come to her when needed.Vyasa acquired his knowledge from the four Kumaras, Narada and Lord Brahma himself.