King Yuri (? - 18 CE, r. 19 BCE - 18 CE) was the second ruler of Goguryeo, the northernmost of the Three Kingdoms of Korea. He was the eldest son of the kingdom's founder King Dongmyeongseong. As with many other early Korean rulers, the events of his life are known largely from the Samguk Sagi.
Yuri was the son of Jumong, the founder of Goguryeo. Yuri was raised where his father grew up by his mother. Yuri's mother, Lady Ye, and Yuri went to Goguryeo in 19 BCE, to go see his father.
King Jumong proclaimed Yuri to be the Crown Prince of Goguryeo. Onjo and Biryu (the sons of So Seo-no) became insecure. So Seo-no took her sons and traveled south to found the kingdom of Baekje. Yuri became King upon Jumong's death later.
Yuri is described as a powerful and militarily successful king. He conquered a Xiongnu tribe in 9 BCE. In 3 BCE, Yuri moved the capital from Jolbon Fortress to Gungnae Fortress.
Han dynasty China, Goguryeo's neighbor, was overthrown by Wang Mang, who established the Xin Dynasty. Wang Mang sent a messenger to Goguryeo to ask for troops to assist in a conquest of the Xiongnu during 12 CE, the 31st year of his reign. Yuri rejected the request and instead attacked Xin.