Portrait of Ishikawa Kazumasa

Tokugawa forcesIshikawa

Ishikawa Kazumasa

石川数正

“The Tokugawa Defector”

1533–1593 (aged 61)

Rank / office
Governor of Hōki
Domain / base
Mikawa → Matsumoto, Shinano
Banner / crest
Bamboo and gentian
Battles in 3D
1 battle

Later imagined depiction · Source: Wikimedia Commons (public domain)

The most senior of the retainers, who had served Ieyasu since his days as an Imagawa hostage and shared the leadership of the eastern and western halves of the domain with Sakai Tadatsugu. He fought at Mikatagahara and many other battles and single-handedly handled negotiations with the Oda and the Toyotomi. But after Komaki and Nagakute he suddenly defected to Hideyoshi; the desertion of a senior retainer who knew all the Tokugawa military secrets shook the house. Granted Matsumoto in Shinano, he laid the foundations of Matsumoto Castle.

Life and battlesGold dots mark battles you can watch in 3D

  1. 1573Genki 3
  2. 1585Tenshō 13

    Defection

    Suddenly left the Tokugawa and went over to Toyotomi Hideyoshi.

  3. 1590Tenshō 18

    Matsumoto Castle

    Granted Matsumoto in Shinano, he laid the foundations of the early modern castle.

Related sites

FAQ

Who was Ishikawa Kazumasa?

Known as “The Tokugawa Defector”. A Tokugawa elder ranking with Sakai Tadatsugu. As Ieyasu's right arm he handled diplomacy, but suddenly defected to Hideyoshi and shook the house to its core.

What rank or office did Ishikawa Kazumasa hold?

Governor of Hōki.

When did Ishikawa Kazumasa live?

Ishikawa Kazumasa was born in 1533 and died in 1593.

Can I watch Ishikawa Kazumasa's battles in 3D?

Yes. On Sengoku 3D you can watch the Battle of Mikatagahara (1573) in 3D, following the deployments and troop movements.