Kakawin Ramayana is an Old Javanese rendering of the Sanskrit Ramayana in kakawin meter. It is believed to have been written in Central Java (modern Indonesia) in approximately 870 AD during the era of Medang Kingdom. Kakawin Rāmâyaṇa is a so-called kakawin, the Javanese form of kāvya, a poem modeled on traditional Sanskrit meters.
Among the Javanese, Kakawin Ramayana has always been considered the pinnacle of artistic expression. The large number of preserved manuscripts attest to it popularity and adaptation. It is the lengthiest of all the Old Javanese kakawins of the Hindu-Buddhist period of Java.
Read more about Kakawin Ramayana: Divergence, Source, Synopsis