Korea's history is divided into four periods: the Three Kingdoms of Koguryo (37 bc-ad 668), Shilla (57 bc-ad 668), and Paekche (18 bc-ad 660); Unified Shilla (668-935); Koryo (935-1392); and Choson (1392-1910). Kevin O'Rourke's The Book of Korean Poetry traces Korean poetry from the pre-Shilla era to the end of Korea's golden poetry period in the Koryo dynasty.There are two poetry traditions in Korea: hanshi (poems by Korean poets in Chinese characters)...