Taejo of Goryeo

Wang Geon, a general under the Later Goguryeo kingdom, defeated the forces of Gyeon Hwon at Cheonju. This victory solidified his power and set the stage for the founding of the Goryeo dynasty.

Wang Geon declared himself king and founded the Goryeo dynasty, with its capital at Songak (modern Kaesong). He unified the Later Three Kingdoms (Later Goguryeo, Later Baekje, and Silla) through a combination of military conquest and diplomatic marriages.

Taejo of Goryeo completed the unification of the Later Three Kingdoms by defeating the Later Baekje kingdom. This brought the entire Korean peninsula under Goryeo rule, ending the Later Three Kingdoms period.

Taejo issued the Ten Injunctions, a set of political and cultural guidelines for his successors. These injunctions emphasized Confucian governance, Buddhist patronage, and the importance of maintaining good relations with China.