FUJIWARA no Kagemichi was a samurai in the imperial capital who was based in the Mino Province and became Kaga no suke (Assistant governor of Kaga Province), and his descendants began to use the name Kato.
藤原景通は美濃を本拠とした京武者で加賀介となり、そこからその子孫は加藤を名乗るようになる。