A poet, Henry Wadsworth Longfellow, wrote The Song of Hiwatha.
An author, J. R. R. Tolkien, wrote both The Hobbit, and The Lord of the Rings.
Apparently they each were inspired by the same [u]source[/u], the Kalevala tales, representing an ancient history of eastern Finland, and Russian Karelia.
Edit: Actually, not one edit occurred, long story short. 
Fantasy, fact or fiction what?
Whenever you see the characteristic poetic metre–long long lines with a headlong feeling–in english verse after the late 19th century, odds are that the Kalevela was their inspiration. Tolkien used it frequently, as did alonfellow in H. Unless I’m misremembering, the song of Tom Bombadil is one of Tolkien’s poems that’s based Finnish poetic forms.