cadet branch of Takeda clan who descended from Seiwa Genji.
The Matsumae clan (松前氏, Matsumae-shi) was a Japanese clan that was confirmed in the possession of the area around Matsumae, Hokkaidō as a march fief in 1590 by Toyotomi Hideyoshi, and charged with defending it, and by extension the whole of Japan, from the Ainu "barbarians" of the north. The clan, originally known as the Kakizaki clan (蠣崎氏), had settled in Kakizaki, Kawauchi, Mutsu on the Shimokita Peninsula. Claiming descent from the Takeda clan of Wakasa Province, the family later took the name Matsumae.