Please answer the following question: Facts:   - rrborn: yangseong '' or '' tang    - mrborn: yangsǒng '' or '' tang    - hanjaborn: 陽成 '' or '' 湯    - hangul: 평원왕 , 평강 -lrb- 상호 -rrb- 왕    - mr: p -rrb- - wang ` yǒngwǒn-wang , p ` yǒnggang -lrb- sangho    - rr: pyeongwon-wang , pyeonggang -lrb- sangho -rrb- - wang      - hangulborn: 양성 '' or '' 탕    - hanja: 平原王 , 平岡 -lrb- 上好 -rrb- 王   Based on these bullet points, write a short biography describing the life of pyeongwon of goguryeo .
A:
king pyeongwon of goguryeo -lrb- ruled 559 -- 590 -rrb- 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 -lrb- though the suishu and tangshu have him as tangseong -rrb- .