이자수는 진성이씨 가문의 안동 입향조로 홍건적의 난(1359-1362)을 진압하는 데 큰 공을 세웠다.
Yi Ja-su was the first person from the Jinseong Yi Clan to settle in the Andong area in the early 14th century. He contributed significantly to the suppression of the Red Turban invasions of Korea (1359-1362).