Rise to power and campaigns against Baekje Gwanggaeto succeeded his father,
Gogukyang, upon Gogukyang's death in 391. Upon Gwanggaeto's coronation, Gwanggaeto adopted the era name
Yeongnak (Eternal Rejoicing) and the title
Taewang (Supreme King), which was equivalent to "emperor", affirming that he was an equal to the Imperial rulers of China. In response,
Asin, the monarch of Baekje, launched a counterattack on Goguryeo in 393 but was defeated. Asin invaded Goguryeo once more in 394, but was defeated again. In the following year, in 396, Gwanggaeto led an assault on Wiryeseong by land and sea, using the Han River, and triumphed over Baekje. surrendering a prince and 10 government ministers.
Northern conquests In 395, while his campaign against
Baekje was ongoing to the south, Gwanggaeto made an excursion to invade the
Khitan Baili clan to the west on the
Liao River, destroying 3 tribes and 600 to 700 camps. In 398, Gwanggaeto conquered the
Sushen people to the northeast, In 400, while Gwanggaeto was occupied with Baekje, Gaya, and Wa troops in Silla, the
Xianbei state of
Later Yan, founded by the
Murong clan in present-day
Liaoning, attacked Goguryeo. Gwanggaeto repulsed the Xianbei troops. In 402, Gwanggaeto retaliated and conquered the prominent fortress called 宿軍城 near the capital of Later Yan. In 405 and again in 406, Later Yan troops attacked
Goguryeo fortresses in Liaodong (遼東城 in 405, and 木底城 in 406), but were defeated both times. In 410, Gwanggaeto attacked
Eastern Buyeo to the northeast. who had resided in Goguryeo as a political hostage since 392, back home to Silla and appointed him as the king of Silla. In 404, Gwanggaeto defeated an attack by the
Wa from the
Japanese archipelago on the southern border of what was once the
Daifang commandery, inflicting enormous casualties on the enemy. ==Death and legacy==