The first mention of the term "bushido" is in the scriptures Koyo Gunkan (甲陽軍鑑) from Takeda-ryū (martial arts school), written around 1616 by samurai Kōsaka Masanobu (1527–1578). It consists of 20 scrolls that mention Bushidō over 30 times. It contains the history of the Takeda family and their military tactics. The Koyo Gunkan describes valor and exploits in battle. For example it is a waste of talent when a Bushidō practitioner takes on administrative roles in government or financial affairs (e.g. dealings in rice, money, timber, or forest land), it emphasis that bushido lies only in "becoming as a spear" on the battlefield. The scrolls were widely disseminated as a martial arts instruction manual by the samurai class and helped to popularize the term.