The Warring States Period was a long violent period of war that existed before the creation hidden villages. This Era was ruled by several strong clans, who were constantly at war against one another.
Here are the 6 known Clans that existed during this period —
6. Uchiha Clan
The Uchiha Clan, or rather the Uchiha were the descendants of Hagoromo’s elder son, Indra Ōtsutsuki. They one of the two strongest Clans during this period. It was constantly at war against those of the Senju. The Uchiha were hired especially to match the Senju Clan. They were feared and reputed for their Kekkei Genkai Dōjutsu, the Sharingan. Ultimately, they joined forces with the Senju to form the first shinobi village, which came to ve known as Konohagakure.