I recall visiting Bodiam Castle as a child, where of which there was a "toilet" - it was pitiful - that, in a slight, dark stone room, consisted merely of a wooden panel placed atop a fixture of bricks with a hole almost the same size as our toilet seats of the present-day. I assume the wooden panel would've been easily removed, and inside there was most probably a bucket to "cleanly" relieve oneself. Bodiam was a 14th century castle, and this comment is based merely on my assumptions. However, there is a slight possibility that the toilet at Bodiam was installed in later years.
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