Who is credited for the invention of the earliest known septic system, a method of waste disposal?

what would we do with out the french 🥖 oolala

The stench contained methane. Gaslights were invented to burn the methane which reduced the stench and provided light.

The explanation refers to strong sewage, but presumably storing sewage was intended.

dear Rajneesh, I think you meant "fosse" as in "fosse septique".