The Matsunaga clan (松永氏, Matsunaga-shi) is a Japanese Samurai Clan who are descended from the Fujiwara clan. The lineage of Matsunaga Danjo Hisahide strengthens the Matsunaga clan's claim to Fujiwara lineage through Hisahide's nephew, Tadatoshi Naito (also known as Naito Joan and Fujiwara John). Tadatoshi Naito's mother was Naito Sadafusa who was from the Naito clan. The Naito clan is descended from Fujiwara no Hidesato (Hokke (Fujiwara)). Tadatoshi Naito would serve as lord of Yagi castle.