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| Iga vs Koka Shinobi |
Shinobi existed throughout Japan but these two villages of Iga and Koka (now called Koga) gave birth to some of the history's most famous ninja including Hattori Hanzō, Fujibayashi Nagato, Momochi Sandayu, Fuma Kotaro and Natori Masatake. The reason noted is that the two regions were independent of the shogunate rule and didn't have a shugo (governor appointed by Shogun) to oversee them (if existed then only by name). Hence in these villages, respective clans formed alliance to have free rein and appoint their own leader by mutual consultation. Thus they were independent to form their own armies and strong fortresses as per way they wished.