Before Ramayana, There are Arjuna Sastrabahu. He was a king inherited from Wisnu
Wisnu is going down to earth with his wife. Both reincarnated as a lover, Wisnu as Arjuna and then get married with his reincarnated wife. The story tell about another hero that relative to him. During the Arjuna Sastrabahu Timeline, Dasamuka as a giant kingdom doesn't like Arjuna Empire and send army to destroy him. But Arjuna defeat Dasamuka, but he must lost his beloved brother.