Miguel de Cervantes spent his young adult life in the military, only becoming an accomplished author later in his life.
I would say this is the appropriate answer, given that he was all of these - a playwright, a short story writer, a poet, and an author. He wrote many plays, he wrote a collection of short stories called Novelas ejemplares, he wrote a lot of poetry, however, he is most known for his novel Don Quixote.
