Which Goguryeo king, commemorated by a huge stele beside the Yalu River, greatly expanded the kingdom between 391 and 413?

Answer and explanation

Correct answer: B. Gwanggaeto the Great

  1. Step 1: The stele was raised in 414 by his son at the capital Gungnae. Step 2. It records the conquests of the king and is a key source for the period. Answer: Gwanggaeto the Great. Why not the others: Jangsu was his son and the other two were kings of rival states.

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