Jeongjong, 10th monarch of Goryeo

Jeongjong of Goryeo (31 August 1018 – 24 June 1046) (r. 1034–1046) was the 10th ruler of the Goryeo dynasty of Korea. He was the second son of Hyeonjong, and the younger brother of Deokjong. At the age of four in 1022, he was made Naesaryeong, a position of high rank, and designated the Prince of Pyongyang. Just before his death in 1046, Jeongjong established primogeniture as national law.

Jeongjong, 10th monarch of Goryeo

Jeongjong of Goryeo (31 August 1018 – 24 June 1046) (r. 1034–1046) was the 10th ruler of the Goryeo dynasty of Korea. He was the second son of Hyeonjong, and the younger brother of Deokjong. At the age of four in 1022, he was made Naesaryeong, a position of high rank, and designated the Prince of Pyongyang. Just before his death in 1046, Jeongjong established primogeniture as national law.