At the highest hill northwest of the Chasuriyama region in Tamba, you can find the Chasuriyama Kofun. If you’re planning on unlocking all allies in Assassin’s Creed Shadows, you won’t miss this one, since you must complete it during Yagoro’s quest.

Finding your way through the dark in the Chasuriyama Kofun in Assassin's Creed Shadows can be difficult, but it is also rewarding at the end.

Here's a complete walkthrough for Azuchi Hyotanyama in Assassin's Creed Shadows, including its location, and all Azuchi Hyotanyama rewards.