Legend 

The deities here are the four sons of King Dasaratha of Ramayana. Lord Ram, the eldest of them is the eighth avatar (incarnation) of Lord Vishnu, who is the Supreme God of the Hindus. Bharata, second amongst them, is the avatar of the Panchajanya (Conch held by Vishnu). Lakshmana is the avatar of the Adisesha, the serpent of infinite measures and on whom Lord Vishnu sleeps in the Ocean of Milk. Satrughna (the One who is destroyer of enemies) is the twin bother to Lakshamana and the youngest. He is the avatar of the Sudarshana chakra held by Lord Vishnu. 

Sree Rama proceeded towards South, through the old path, which he trekked in search of Sithadevi.  At last  he reached this beautiful place, with rattling canal on the right side, smiling paddy fields in the rear, surrounded by dense forest.  He felt it an ideal place and started his meditation.

As Lakshmana, Bharatha and Sathrughna could not bear the disappearance of their beloved brother any longer, they also left Ayodhya and pursued the path of their brother, believing that their brother would have gone towards South.  At last they found him.  They said they would also sit near him.  So, Lakshmana found at this wounderful land place at Koodapulam, Bharatha at Amanakara and Sathrughna at Methiri, which are equi distant from one another.  As years rolled on, four temples rose in each place in their names.