pronoun
Archaic pronoun for 'that place' or 'there', used in classical Japanese.
其処許に立てる者は誰ぞ。
Who is the person standing there?
pronoun
Archaic second-person pronoun used by samurai when addressing equals or inferiors. Not used in modern Japanese.
其処許、名を名乗れ。
You, state your name.
Derived from classical Japanese そこ (there) + もと (originally 'under', 'base', later used as a polite second-person suffix). The exact historical development is uncertain.