Yeon Ja-yu

Yeon Ja-yu (Hangul: 연자유, Hanja: 淵子遊, ?-?) was the Magniji (Prime Minister) of Goguryeo during its waning days, and was the grandfather of Yeon Gaesomun, who was Dae Magniji and dictator of Goguryeo before its fall. Yeon Ja-yu was the father of Yeon Taejo, the father of Yeon Gaesomun, and Magniji after Ja-yu. Historical records do not provide his life dates or his actions as Magniji.

Read more about Yeon Ja-yu:  Background, Legacy, Last Name