Mid 19th century; earliest use found in The Contemporary Review. From mytho- + poetry, perhaps partly after Hellenistic Greek μυθοποίησις or μυθοποιία.
Definition of mythopoetry in US English:
mythopoetry
nounˌmɪθə(ʊ)ˈpəʊɪtri
Mythic poetry; poetry concerned with myths.
Origin
Mid 19th century; earliest use found in The Contemporary Review. From mytho- + poetry, perhaps partly after Hellenistic Greek μυθοποίησις or μυθοποιία.