Text · Vaishnava · South India · Tamil Nadu
Kamba Ramayanam
Kamban's 12th-century Tamil epic of Rama, in which Rama is divine from the start yet never claims to be Vishnu's avatar, and the dying Ravana names him the cause behind the Vedas rather than any one of the three gods.
Sources: Ramavataram — Wikipedia; The Rama story as embellished by Kamban · see Kamba Ramayanam's web