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Gwanggaeto was born in 374CE
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In 400, Later Yan, founded by the Murong clan of the Xianbei in present-day Liaoning province, attacked Goguryeo. Gwanggaeto responded swiftly, recovering most of the territory seized by the Xianbei and driving most of them from Goguryeo.
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King Gwanggaeto died of unknown disease in 413, at the age of thirty-nine. Although Gwanggaeto ruled for only twenty-two years and died fairly young, his conquests are said to mark the high tide of Korean history
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Then in 402, he decided to launch an attack on Later Yan itself, determined to protect his Kingdom from further threat.
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At the age 17 he bedme king he called himself Supreme king
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Gwanggaeto led his army against the neighboring kingdom of Baekje
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in 395 he tried to take over Baekje
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In 392, with Gwanggaeto in personal command, Goguryeo attacked Baekje with 50,000 cavalry, taking 10 walled cities along the two countries' mutual border. This offensive infuriated King Asin of Baekje and he subsequently planned a counter-offensive against Gwanggaeto, a plan he was forced to abandon when his invasion force was defeated by Goguryeo in 393.
