Why is Persia called a poetic country?

10 to 15 century witnessed the unprecedented prosperity of Persian literature, and Persia is known as the country of poetry. The achievements of Persian literature in the Middle Ages were mainly in poetry. There were many outstanding poets in the 5th and 6th centuries, among them, Ferdowsi, khayyam, Sadi, Hafez and others all enjoyed a high reputation in the world.