Britannica Sources used in this answer

Which rulers began building centralized states in Goguryeo, Baekje, and Silla?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Map of the Korean Peninsula highlighted in orange, showing North Korea in the north and South Korea in the south. The peninsula is bordered by China and Russia to the north, the Yellow Sea to the west, the East Sea (Sea of Japan) to the east, and Japan across the sea to the southeast. A small inset globe at the top left shows the peninsula's location in East Asia. — Korea Map of the Korean Peninsula, indicating northern and southern regions.

The process of state building and the centralization of power in the ancient Korean kingdoms were initiated by specific rulers, distinct from the legendary figures traditionally credited with the founding of these states.1

The rulers who began the actual task of building centralized states were:

Goguryeo: King Taejo (reigned 53–146 ce).1
Baekje: King Koi (reigned 234–286).1
Silla: King Naemul (reigned 356–402).12

These monarchs oversaw the transition from tribal leagues to more structured, centralized kingdoms. This evolution involved the establishment of hereditary monarchies, the organization of centralized military systems, and the implementation of administrative units that allowed the central government to collect taxes and labor from the populace. Over time, these states further solidified their authority through the adoption of laws, decrees, and state religions such as Buddhism.132