A sentence from 五輪書: おのづから道の器用有りて、天理をはなれざる故か。 I found a question about ～ざる and ～ぬ on 知恵袋. The only answer claims that ～ぬ and ～ざる are both the 連体形 of ～ず and ～ざる is a "complementary" conjugation, ...
In a shrine graffito written in 1559, two carpenters complain: 其時座主ハ大キナコスデオチヤリテ一度モ焼酎ヲ不被下候 'At that time, the high priest (stingy bugger!) gave us not even a drop of shochu to drink.' The form ...