Shot at Yoyogi Hachiman-Gu, a Shinto shrine in Yoyogi, Tokyo.
The deity enshrined in this main hall is the Emperor Ojin. It was identified with Hachiman, a war god. So the shrines dedicated to Hachiman were popular for Samurai. I thought the subjugation was not satisfied only by the military power. The financial power was also necessary to appeal to arms.
For this reason, there was another small shrine next to the main hall and a commercial god was enshrined. These banners were dedicated to the deity.