Takeda Katsuyori
Takeda Katsuyori became the "daimyō" of the Takeda clan. Katsuyori was ambitious and wanted to continue his father's legacy. He moved to take Tokugawa forts. However, an allied force of Tokugawa Ieyasu and Oda Nobunaga dealt a crushing blow to the Takeda in the Battle of Nagashino when Nobunaga's matchlock-armed infantry destroyed the Takeda cavalry. Ieyasu seized the opportunity to defeat the weakened Takeda led by Takeda Katsuyori in the battle of Tenmokuzan. Katsuyori committed suicide after the battle and the Takeda clan never recovered.