Title: Koguryŏ yumin ŭi nara Che wa Tang, kŭrigo Silla, Parhae, Ilbon kyoryusa
Subjects: History, Foreign relations, Relations
Places: China, Koguryŏ (Kingdom), Korea, Japan
People: Chŏng-gi Yi (approximately 732-781)
Time periods: Tang dynasty, 618-907