The Yamataru tribe was a tribe of warriors who lived in the Taru Mountains before the Fall of the Kami, in the lands which would be known as Naishou province, alongside the Morikawa tribe and the Takanobu tribe. The Yamataru built numerous shrines to the Fortunes.  The settlement which would become Hitori Mura was their seat of power. 
Dawn of the Empire Edit
When the samurai, followers of the Kami, first arrived in the region, they found it a prosperous place, for the Takanobu had slowly driven the other tribes out of the valley and dominated the area. All the tribes joined the nascent Emerald Empire.