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Wiki information Pyeongwon:

Pyeongwon of Goguryeo
Deceased Person, Person

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.

Yeongyang of Goguryeo
Deceased Person, Person

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.