In the Hindu epic the Mahabharata, Ashwatthama (Aśvatthāmā) or Drauni was the son of guru Drona and Kripi (sister of Kripacharya). and a pivotal character in the Mahabharata. The grandson of the sage Bharadwaja, Ashwatthama ruled the northern region of Panchala with Ahichhatra as his capital, being subordinate to the rulers of Hastinapura. He was a Maharathi who fought on the Kaurava side against the Pandavas in the Kurukshetra War. He became a Chiranjivi (immortal) on being blessed by Shiva.
According to The Mahabharata, Ashwatthama means "the sacred voice which relates to that of a horse". It is so-called because when he was born he cried like a horse.
Some of the patryomics are Dronaputra-He was referred to as "Dronaputra" as he was son of Dronacharya, Guruputra-Kauravas and Pandavas used to call him "Guruputra" as he was their guru's son and Kripi Kumara-His mother's name was Kripi.
Ashwatthama is the son of Drona and Kripi. He was born in a cave in a forest (in present-day Tapkeshwar Mahadev Temple, Dehradun, Uttarakhand). Drona does many years of severe penance to please Lord Shiva in order to obtain a son who possesses the same valiance as Lord Shiva.
Ashwatthama is born with a divine gem on his forehead which gives him power over all living beings lower than humans; it protects him from hunger, thirst, fatigue, old age and all sorts of diseases, weapons and deities. The powerful gem almost makes Ashwatthama invincible and immortal. Though an expert in warfare, Drona lives a simple life, with little money or property. As a result, Ashwatthama has a difficult childhood, with his family unable to even afford milk. Wanting to provide a better life for his family, Drona goes to the Panchal Kingdom to seek aid from his former classmate and friend, Drupada. However, Drupada rebukes the friendship, claiming a king and a beggar cannot be friends, humiliating Drona.
After this incident, and seeing the plight of Drona, Kripa invites Drona to Hastinapur. Thus, Drona becomes the guru of both the Pandavas and Kauravas.