Trishira or Trisirasไทย : ตรีเศียร, that is, one having three heads, was an asura

Asura

-In Hinduism:In Hinduism, the Asuras constitute a group of power-seeking deities, sometimes considered sinful and materialistic. The Daityas and Danavas were combinedly known as Asuras. The Asura were opposed to the Devas. Both groups are children of Kasyapa...

 (a demon), and reference to him is found in the Ramayana

Ramayana

The Ramayana is an ancient Sanskrit epic. It is ascribed to the Hindu sage Valmiki and forms an important part of the Hindu canon , considered to be itihāsa. The Ramayana is one of the two great epics of India and Nepal, the other being the Mahabharata...

. He was one of the seven sons of Ravana

Ravana

' is the primary antagonist character of the Hindu legend, the Ramayana; who is the great king of Lanka. In the classic text, he is mainly depicted negatively, kidnapping Rama's wife Sita, to claim vengeance on Rama and his brother Lakshmana for having cut off the nose of his sister...

, and his other brothers were Indrajit

Indrajit

Indrajit or Meghanatha , a warrior mentioned in the Indian epic Ramayana, was the son of the Lankan king Ravana. The word 'Indrajit' literally means the 'conqueror of Indra '....

, Prahasta

Prahasta

In the Hindu epic the Ramayana, Prahasta was a powerful rakshasa warrior, and chief commander of Ravana's army of Lanka.Prahasta leads Ravana's army in the wars against Yama, Kubera and the Devas, and the Asuras and Daityas, through which Ravana establishes his sovereignty over the three worlds...

, Atikaya

Atikaya

Atikaya was the son of Ravana and his second wife Dhanyamalini in the Ramayana epic. Atikaya was the younger brother of Indrajit and was extremely powerful...

, Akshayakumara

Akshayakumara

Akshayakumara was the youngest son of Ravana and the brother of Indrajit. In the Ramayana, When Hanuman started destroying the Ashoka Vatika after talking to Sita, Ravana sent him at the head of a Rakshasa army to take care of it....

, Devantaka and Narantaka.

He engaged Rama

Rama

Rama or full name Ramachandra is considered to be the seventh avatar of Vishnu in Hinduism, and a king of Ayodhya in ancient Indian...

in a fight and hit him with a number of arrows. At this Rama told that the arrows were nothing but like flowers being showered on his body. Thereafter, a duel ensued, in which Rama killed Trishira.