Yufu Ietsugu served as a bushō during the Sengoku and Azuchi-Momoyama periods. He was a retainer of the Bekki clan and was in the first seat as a tairō, or council elder, of the Tachibana castles in Fujikita.
Ietsugu was born as the son of Yufu Kaga-no-kami Korekatsu, the lord of Yufuinyama Castle. In 1526, he had his first experience in battle at Umagadake. Thereafter, he served under Tachibana Dōsetsu who was either his uncle or cousin. In 1574, he retired from his position but, from the sixth month of 1579, he served as the chamberlain of Nishi Castle on Mount Gara. Later, Ōtsuryū Shigetada served as the chamberlain of this castle.
His eldest son, Yufu Koreshige, was engaged by a separate family and served the Ōtomo clan so his second son, Yufu Koreaki, inherited the headship of the clan. Perhaps for this reason, Koreshige does not appear in the genealogy of retainers of the Yanagawa domain.