Yūki Naotomo
Yūki Naotomo (1325–1343) was the seventh head of the Shimōsa Yūki clan. When his father Tomosuke fell at the Battle of Tatarahama in 1336, he inherited the clan at the age of twelve. He served the Northern Court against the Southern Court Shirakawa Yūki and Seki houses.
In 1343 he joined Kō no Morofuyu's siege of Seki Castle in Hitachi, held by Kitabatake Chikafusa, and on 3 April was mortally wounded in a sortie. He died aged nineteen, leaving no heir, and his younger brother Naomitsu succeeded him.