Wang Jian takes South Korea as his country name. Arab merchants in the Koryo era spread this name to the European world. Buddhism is the national religion of Korea. The Goryeo Tripitaka is one of the world's treasures. Today, the government of the Democratic People's Republic of Korea believes that Korea is the first unified country in Korean history. However, many scholars do not agree with this view. They believe that Silla was the first unified country in Korean history. For example, South Korean scholar Lee said: "After all, it is the territory and people of Silla, and the social culture formed there constitutes the mainstream of Korean history." Former South Korean President Kim Dae-jung also mentioned that the unified Silla is the source of South Korean history.