According to the Samguk sagi, Kim Dae-Mun explained that the title "Chachaung" meant a shaman in Old Korean.

He was the eldest son of Park Hyeokgeose, Silla's founder, and Lady Aryeong.

Alternatively, the Suseo (隋書), a Chinese history book compiled during the reign of Taizong of Tang, suggests that Namhae actually originated from Baekje.

[3] In 8, when the Namhae of Silla heard that Talhae was benevolent, he married his eldest daughter to him.

[note 1][5] The Bukmyeong(北溟) people plowed the fields and got Royal Seal of Ye (예왕지인; 濊王之印), previously used by Buyeo's kings, and dedicated it to Silla in 19.