As with many other early Korean rulers, the events of his life are known largely from the Samguk sagi.

In 12 AD, Wang Mang sent a messenger to Goguryeo to ask for troops to assist in the conquest of the Xiongnu.

Haemyeong was proclaimed the crown prince of Goguryeo after the death of Dojeol, who was King Yuri's eldest son.

Recently, some historians have interpreted historical evidence as indicating that Yuri may not have been the son of Jumong, but rather was a usurper.

However, alternative theories suggest that their surnames are different because Yuri was a usurper from a different family, with the above story being created after the fact.

This is interpreted by those suggesting usurpation as implying a removal of Jumong loyalists from Yuri's government.

General Bu Bun-no(扶芬奴) and Oi served Goguryeo through most of King Yuri's reign and played active roles in the kingdom.

Another piece of evidence tied to the usurpation theory is the story of Jumong's broken sword.