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Wiki information Pyeongwon:
King Pyeongwon of Goguryeo was a 6th-century Korean monarch, the 25th ruler of Goguryeo, the northernmost of the Three Kingdoms of Korea. King Pyeongwon was also known as King P’yŏnggang sangho. His surname was Yangseong.
King Yeongyang of Goguryeo was the 26th king of Goguryeo, the northernmost of the Three Kingdoms of Korea. He was the eldest son of King Pyeongwon.