King Taejo of Goryeo vs Vytautas the Great

Wang Geon (Taejo) overthrew the Later Goguryeo state and established the Goryeo dynasty, with its capital at Songak (Kaesong). This marked the beginning of a new era in Korean history.

Taejo married women from powerful local clans to secure their loyalty and integrate regional powers into the Goryeo state. This policy helped stabilize the new dynasty.

Taejo completed the unification of the Later Three Kingdoms (Later Goguryeo, Later Baekje, and Silla) under Goryeo rule. This ended the period of division and established a unified Korean state.

Taejo issued the Ten Injunctions, a set of political guidelines for his successors. These stressed the importance of Buddhism, diplomacy with China, and avoiding internal conflict.

Vytautas signed the Treaty of Salynas with the Teutonic Knights, ceding Samogitia to the Order. This was a temporary concession to gain support for his eastern campaigns, but it later led to conflict.

Vytautas led a crusade against the Golden Horde but was defeated at the Battle of the Vorskla River. The defeat halted Lithuanian expansion into the steppes and weakened Vytautas's position.

Vytautas commanded the Polish-Lithuanian army at the Battle of Grunwald, defeating the Teutonic Knights. This was one of the largest battles of medieval Europe, breaking the Knights' power and securing Lithuanian independence.

Vytautas attempted to be crowned King of Lithuania, supported by Holy Roman Emperor Sigismund. The coronation was blocked by Polish nobles who feared Lithuanian independence, and Vytautas died before it could occur.