Duke of Buyeo

Duke Buyeo or Marquess Buyeo (died 1112; born Wang Su) was a Goryeo Royal Prince as the second son of King Munjong and Consort Ingyeong, full brother of Wang Do and Wang Yu.

Life and issue
In 1080 (34th years reign of his father), Wang Su was honoured as Marquess Buyeo and given "1000 sik-eup (식읍 1,000호) after became Gaebuuidongsamsa Geomgyosagong Susangseoryeong . Six years later, he married his own half sister or maternal first cousin (his aunt/stepmother's eldest daughter), Princess Jeokgyeong  and have a son named Wang Myeon  together. However, this marriage was very controversial at that time since Buyeo's brothers, include: Duke Jinhan, Marquess Geumgwan, Marquess Byeonhan and others criticized him for having an incestuous marriage, also begged their elder brother, King Seonjong to annul the marriage, but Seonjong didn't want to hear the appeal and rejected it.

Wang Su later appointed as Susado, received "2000 sik-eup" (식읍 2,000호) and honoured as Duke Buyeo. In 1094 (ascension year of King Heonjong), he became Sutaebo, given "3000 sik-eup" (식읍은 3,000호) and "300 sik-sil" in 1095 (ascension year of King Sukjong).

Wang Su was exiled to Yangmok-gun, Gyeongsan-bu (now Yangmok-myeon, Chilgok-gun, North Gyeongsang Province) in 1099 (4th years reign of King Sukjong) without detailed case or charges, but it was recorded that the king personally gave books related Confucianism and Buddhism to his brother who was going to the exile place.

In 1112 (7th years reign of King Yejong), Wang Su committed a crime again and moved to Geoje-hyeon while his only son, Wang Myeon exiled to Jillye-hyeon (now Geumsan-gun, South Chungcheong Province) at the same time. On his way to Geoje-hyeon, Wang Su died at Hyeonpung-hyeon (now Hyeonpung-eup, Dalseong-gun, Daegu-si) and Yejong then stopped the inquiry for three days upon hearing about his uncle's death. A year later, Wang Myeon was pardoned and able to return to Gaegyeong, also received back his position as Sagong.