Duke Yangyang

{{about|a Korean prince|other uses|Yang Yang (disambiguation){{!}}Yang Yang}}

{{Infobox royalty

| name = Wang Seo

| title = Marquess Deokyang
({{Korean|hangul=덕양후|hanja=德陽侯|labels=no}})Goryeosa vol. 21 – "Prince Wang Seo given royal title as Marquess Deokyang in April (3rd year of Sin-jong's reign)".{{Cite web|url=http://db.history.go.kr/KOREA/search/searchResult.do?sort=levelId&dir=ASC&start=-1&limit=20&page=1&pre_page=1&itemIds=&indexSearch=N&codeIds=PERIOD-0-3&synonym=off&chinessChar=on&searchTermImages=%EB%8D%95%EC%96%91%ED%9B%84%C2%A0&searchKeywordType=BI&searchKeywordMethod=EQ&searchKeyword=%EB%8D%95%EC%96%91%ED%9B%84&searchKeywordConjunction=AND#searchDetail/kr/kr_021r_0050_0050_0050/10/1/10/r|script-title=ko:고려시대 史料 Database|website=Goryeosa|access-date=October 7, 2021|language=ko}}.
Duke Yangyang
({{Korean|hangul=양양공|hanja=襄陽公|labels=no}})It was given upon Wang Seo's older brother's ascension to the throne (Goryeosa vol. 91 – "Wang Seo, the Duke Yangyang").

| image =

| alt =

| caption =

| birth_name =

| birth_date = after 1181

| birth_place = Goryeo

| death_date = ?

| death_place = Goryeo

| burial_date =

| burial_place =

| spouse =

| issue = Wang Wi
Wang Byeong
Wang In
Wang Hui
Lady Wang

| royal house = House of Wang

| father = Sinjong of Goryeo

| mother = Queen Seonjeong

| religion = Buddhism

| module = {{Infobox Korean name|child=yes

|hangul=양양공 or 덕양후

|hanja=襄陽公 or 德陽侯

|rr=Yangyang-gong or Deogyang-hu

|mr=Yang'yang-gong or Tŏk'yang-hu

|hangulborn=왕서

|hanjaborn=王恕

|rrborn=Wang Seo

|mrborn=Wang Sŏ}}

}}

Wang Sŏ, known by his title of Marquess Deokyang and later Duke Yangyang, was a Goryeo Royal Prince as the second son of King Sinjong and Queen Seonjeong,{{Cite web|url=http://db.history.go.kr/KOREA/search/searchResult.do?sort=levelId&dir=ASC&limit=20&page=1&pre_page=1&codeIds=PERIOD-0-3&searchTermImages=%EC%96%91%EC%96%91%EA%B3%B5&searchKeywordType=BI&searchKeywordMethod=EQ&searchKeyword=%EC%96%91%EC%96%91%EA%B3%B5&searchKeywordConjunction=AND#searchDetail/kr/kr_091r_0010_0020_0010/5/3/5/r|script-title=ko:고려시대 史料 Database|website=Goryeosa|access-date=October 7, 2021|language=ko}} also the only younger brother of King Huijong.{{Cite web|url=http://db.history.go.kr/KOREA/search/searchResult.do?sort=levelId&dir=ASC&limit=20&page=1&pre_page=1&codeIds=PERIOD-0-3&searchTermImages=%EC%96%91%EC%96%91%EA%B3%B5&searchKeywordType=BI&searchKeywordMethod=EQ&searchKeyword=%EC%96%91%EC%96%91%EA%B3%B5&searchKeywordConjunction=AND#searchDetail/kr/kr_088r_0010_0960/5/1/5/r|script-title=ko:고려시대 史料 Database|website=Goryeosa|access-date=October 7, 2021|language=ko}} Through his third son, he would eventually become an ancestor of King Gongyang. In 1204, his father visited his manor, but died there not long after that. In 1211, he was exiled alongside Huijong by Ch'oe Ch'ung-hŏn to Ganghwa Island.{{Cite web|url=https://terms.naver.com/entry.naver?docId=890922&mobile&cid=62135&categoryId=62213#TABLE_OF_CONTENT5|script-title=ko:고려 희종 7년, 신미년(辛未年), 1211년|website=Naver|access-date=October 7, 2021|language=ko}}