One of the Kauravas, killed by Bhima as per Mahabharata Adiparva Chapter 67 verse 102 and Bhishmaparva Chapter 88 verse 28.

The twelve sons born to Kashyapa and Aditi were called Dwadashadityas. They are Dhata, Mitra, Aaryama, Rudra, Varuna, Surya, Bhaga, Vivasvan, Poosha, Savita, Twashta, Vishnu. In addition, Aditi had 21 children. They are all known as Aadityas. From Aditi’s thirty three sons, the 33 crore gods emerged. The eldest among the sons was Indra and Vamana was the youngest, as per Mahabharata Adiparva Chapter 66 verse 36 and Ramayana Aranyakanda Sarga 14 verse 14.

Though we use Aaditya mainly for Surya, there are many aadityas as per Rigveda, chief among whom was Varuna. Though the names of the adityas now serve as alternate names for Surya, in the vedic period, they were separate gods. Also, many devas who are reduced to the role of digpalakas now – Indra, Agni etc were the main gods in the vedas. The adityas have been absorbed into Surya’s identity, Maruttas to Vayu, and Rudra to Shiva, as per Rigvedasamhita (Sardar K M Panicker’d foreword)

Vishnu made the first mace with the bones of an asura named Gada. He killed many asuras like Heti with this and was known hence as Aadigadadhara.

During the samudra manthan, the Mandara mountain started sinking. To raise it, Vishnu incarnated as a tortoise. This tortoise (kurma) is called Aadikurma (see Indradyumna, Avatar) as per Mahabharata Adiparva Chapter 18 verse 12.

A sage. When Arjuna went to Shiva, with Krishna, in his dreams, he is said to have visited this sage’s hermitage.

The daughter of Atri, who was married to Angiras. Angiras always spoke harshly to Aatreyi, who complained about this to her father. Atri told her that her husband was a son of Agni and hence the anger. He advised that she should bathe him. She took the advise and transformed into a river to placate him. As per Brahmandapurana, this river is called Parushni.

Atri’s wife Anasuya is also called Aatreyi.

A river, as per Mahabharata Sabhaparva Chapter 9 verse 22.

The wife of King Ooru. Swayambhuvamanu and Shatarupa had two sons – Priyavrata and Uttanapada. Uttanapada and Suruchi had 3 sons – Uttama, Suneeti, Dhruva. Dhruva’s three children were Shishti, Bhavan, Shambhu. Shishti had 5 sons – Ripu, Ripunjaya, Shipra, Vrikala, Vrikatejas. The son of Ripu and Brahati was Chakshusha. Chakshusha and Virani had a son named Manu. Manu’s son is Ooru. Ooru and Aatreyi had six sons – Anga, Sumanas, Swati, Kratu, Angiras, Gaya, as per Agnipurana Chapter 18.

A sage, who had the power to move among planets. He once went to devaloka as Indra’s guest. He consumed amrit, watched the apsaras’ dance and felt he would like a devaloka for himself. He approached Vishwakarma who built one for him. Soon the asuras captured it. Though Vishwakarma got it back, Aatreya returned to his own hermitage on the banks of the Gautami. As per Brahmapurana he meditated there for a long time and attained moksha.

He was present at Janamejaya’s sarpasatra as per Mahabharata Adiparva Chapter 53 verse 8. He was Vamadeva’s disciple as per Mahabharata Vanaparva Chapter 192 verse 6. He advised his disciples on Nirgunabrahma as per Mahabharata Anushasanaparva Chapter 137 verse 7.