A castle cesspit is an underground pit used to collect human waste, connected directly to medieval toilets known as garderobes via vertical stone chutes. These pits formed a crude yet vital sanitation system, using gravity to move waste away from living quarters and into a common collection zone.

Structure and Design:
Placement: Built at the base of outer walls, deep in castle basements, or beneath courtyards to isolate foul odors from the great hall and chambers.

Chutes: Vertical stone shafts running through the massive thickness of the castle walls, linking multiple toilet tiers to a single collection pit.

Drainage: Often unsealed or semi-permeable, allowing liquids to seep into the ground while solids accumulated. Some designs used nearby streams or rainwater to flush contents naturally.

Defense and Risks:
Security Flaw: Long, open vertical shafts created a major security risk; enemy forces could occasionally scale or infiltrate a fortress through the latrine chutes.

Mitigation: Castles later added iron bars beneath seats or built protective masonry walls around exterior shaft exits.

Maintenance:
Gong Farmers: Workers known as gong farmers were hired to manually shovel and empty accumulated waste from the pits during the night, hauling the material away for use as fertilizer.