Nulji (reigned 417–458) was the nineteenth ruler (maripgan) of Silla, one of the Three Kingdoms of Korea.
[1] Nulji married the daughter of King Silseong of Silla, who nonetheless exiled Nulji's younger brothers as hostages to Goguryeo of northern Korea and as diplomats and influential architects to Wa of Japan.
[3] According to one story, in 418 Nulji sent a loyal retainer named Bak Je-Sang [ko] to rescue his brothers from Goguryeo and Wa.
After these difficult events, Nulji worked to free Silla from Goguryeo domination.
called Beakje-Silla alliance (나제동맹; 羅濟同盟)[5][6] Nulji's reign saw the continuation of a long process of centralization in Silla, marked his father's change of his title to "maripgan" (마립간; 麻立干), which is believed to represent a higher level of authority than the previous title "isageum" (이사금; 尼師今).