Now more information about Uparichara Vasu, Thodiththol Chola.He was the first King to conduct a Festival for Indra called Indra Vizha in Tamil. Silappadikaram ,one of the five Epics of India,devotes a chapter ‘ Vizhaa Kaathai, விழாக் காதை.This contains detailed procedure to be followed in the festival which was a sort of Thanksgiving to Indra.Contrary to what is known, this Festival was started in the North ,in Chedi Kingdom by Uparichara Vasu, a Chozha King. Check this Link https://www.whatisindia.com/inscriptions/south_indian_inscriptions/volume_3/no_205_aditya_ii_karikala.html#_ftnref7

Krishna Lifts Mountain Indra Vizha By Early Cholas

Uparichara.

Uparichara was a king of Chedi belonging to the Puru Dynasty. He was known as the friend of Indra. During his reign, Chedi kingdom had a good economic system and contained much mineral wealth, which made a lot of merchants around the world, come to the Kingdom. It was abundant in animals and corn. There were many towns and cities in the kingdom. He possessed a very special chariot. He introduced a festival in his kingdom in the honour of Indra. The festival involved planting of a bamboo pole every year, in honour of Indra. The king will then pray for the expansion of his cities and kingdom. After erecting the pole, people decked it with golden cloth and scents and garlands and various ornaments. From Chedi, he ruled a large territory, placing his sons as governors of various provinces. His son Vrihadratha (Maharatha) was installed in Magadha, who later fathered Emperor Jarasandha. His other sons, viz., Pratyagraha, Kusamva (Manivahana), Mavella and Yadu also became governors at various places. Thus the Chedi king attained the status of an emperor and his kingdom became a vast empire. He diverted the waters of river Suktimati from the locks of the Mountain Kolahala, for irrigating his capital-city which he named Suktimati. (1,63)

• This beautiful city of the Chedis was called after the Oyster (14,83)

His wife Girika, was from the valley of Kolahala. Girika’s brother was installed as the generalissimo of Vasu’s army. Apart from his five royal sons, he had a son and a daughter born of a woman of fisherman community. The male child, in due course established the Matsya Kingdom and founded the royal dynasty called Matsya Dynasty. The female child lived as a member of fishermen community. Her line established as fishermen on the banks of river Yamuna, in the kingdom of Kurus. The famous Kuru king Santanu‘s wife Satyavati was from this fishermen community. The author of Mahābhārata, vis Krishna Dwaipayana Vyasa and the Kuru kings viz Chitrangada and Vichitravirya were the sons of Satyavati. Pandavas and Kauravas were the grandsons of Vichitravirya.(1,63)

……….Another story connects Vasu with vegetarianism in ancient India. Filled with doubts respecting the propriety of eating flesh, some sages asked Uparichara Vasu for solving them. King Vasu, knowing that flesh is inedible, answered that it was edible. From that moment Vasu fell down from the firmament on the earth. After this he once more repeated his opinion, with the result that he had to sink below the earth for it. (13,115) http://www.sacred-texts.com/hin/m13/m13b080.htm