After the North-South Period, successor states fought for control during the Later Three Kingdoms period. The peninsula was soon united by Emperor Taejo of Goryeo. Like Silla, Goryeo was a highly cultural state and created the Jikji in 1377, using the world's oldest movable metal printing press.[15]
The Mongol invasions in the 13th century greatly weakened Goryeo. However, Goryeo continued to rule Korea as a tributary ally to the Mongols. After the fall of the Mongolian Empire, Goryeo continued its rule. After severe political strife and continued invasions, Goryeo was replaced by the Joseon Dynasty in 1388 following a rebellion by General Yi Seong-gye. General Yi declared the new name of Korea as Joseon in reference to Gojoseon, and moved the capital to Seoul.