 Nulji, the king of Silla, who had been a vassal of Jangsu, broke off relations with Goguryeo in 454.Jangsu invaded Silla in 468, expanding his domain into parts of Gangwon Province, and again in 489, capturing 7 walled cities and expanding his domain into parts of North Gyeongsang Province.Silla emerged as a major player in the Korean Peninsula after its betrayal of Baekje and conquest of the Han River region from Goguryeo in 553, but Goguryeo and Baekje applied political, military, and economic pressure against Silla.