Sonjuk Bridge
Built in 1290 , it is famous as the place where famed Confucian scholar and statesman Jeong Mong-ju was assassinated , allegedly on the orders of the Yi Bang-won , son of the first king of the Joseon Dynasty , Yi Seong-gye . 
<triplet> Yi Bang-won <subj> Yi Seong-gye <obj> father <triplet> Yi Seong-gye <subj> Yi Bang-won <obj> child