Sassa Narimasa (佐々 成政, February 6, 1536 – July 7, 1588), also known as Kura-no-suke (内蔵助), was a Japanese samurai of the Sengoku through Azuchi-Momoyama period.[1] He became a retainer of Oda Nobunaga in 1550[1] and was granted Etchū Province as a reward for helping Shibata Katsuie fight the Uesugi clan. After Nobunaga's death, in 1584 he joined Tokugawa Ieyasu in unsuccessfully challenging Toyotomi Hideyoshi. He submitted to Hideyoshi and was spared his life. In 1587, he was given a fief in Higo Province in Kyushu. However, due to difficulties in suppressing a local revolt, he committed suicide (Seppuku) by Hideyoshi's instruction in 1588.[1] His daughter married kuge Takatsukasa Nobufusa and they had a son Nobuhisa.[2]