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| 346–375 |
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The reign of King K n Ch'ogo witnessed the state of Paekche, having arisen in the Han River basin, become a centralized aristocratic state with hereditary kingship. | 1 |
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| c. 360–390 |
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| This was the period of greatest Japanese influence in Korea through activities in the states of Silla and Paekche. | 2 |
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| 365–402 |
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| During the reign of King Naemul, Silla, having emerged from a walled-town statelet in the Chinhan area, became a confederated kingdom of considerable size. | 3 |
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| 369 |
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| Paekche destroys Mahan. | 4 |
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| 371 |
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Paekche attacked north against Kogury , reaching as far as P'yngyang and killing King Kogugwn, forcing Kogury to reorganize under King Kosurim (r. 371–384). Paekche also sought ties with the Eastern Jin dynasty in China and the Wa in Japan. | 5 |
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| 372 |
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| Buddhism was adopted in Kogury. | 6 |
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| 373 |
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| Kogury established the National Confucian Academy. Kogury's administrative code was promulgated, and efforts were begun to rebuild state institutions after attacks from both north and south. | 7 |
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| 384 |
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| The Paekche king adopted Buddhism. | 8 |
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| 391–413 |
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| In the reign of King Kwanggaet'o, Kogury's expansion drive progressed through military conquest. Lands were gained north of the Yalu River in Manchuria, and Paekche was attacked in the south. Better relations were achieved with Chinese states to the north; meanwhile, Paekche attained better ties with southern Chinese states and with Wa, the former to keep Kogury at bay and the latter to attack Silla. | 9 |
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| 400 |
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| War erupted between Silla and the small, southernmost state of Kaya, which had had maritime contacts with the Chinese commanderies and with Wa. Silla obtained help from King Kwanggaet'o of Kogury. | 10 |
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| 413–490 |
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| The reign of King Changsu brought Kogury to the height of its power and glory. He kept ties with dynastic houses in both China's north and south and manipulated them to his own advantage. He moved the capital to P'yngyang (427), which became a political, economic, and social center of “national” life. The Paekche capital at Hansng (near modern Kwangju) was taken and the Paekche king caught and killed (475), forcing Paekche to move its capital to Ungjin. | 11 |
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| 433 |
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| Silla allied with Paekche to ward off Kogury. Under King Chabi (r. 458–479), Silla became independent of Kogury pressures, and the strong ties to Paekche were consolidated through marriage. | 12 |
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