There is no single discoverer of ammonium chloride. It was known to ancient alchemists and was likely first produced by heating together ammonium salts and chloride salts.

However, some key figures in its early history include:

* Geber (Jabir ibn Hayyan): An 8th-century Persian alchemist credited with the first recorded production of ammonium chloride. He called it "sal ammoniac" and described its properties.

* Al-Razi (Rhazes): A 9th-century Persian physician and alchemist who provided a detailed description of sal ammoniac and its uses in medicine.

* Later alchemists: Continued to study and experiment with ammonium chloride, exploring its properties and uses.

It wasn't until the 18th and 19th centuries that its chemical composition was fully understood and it was given the name "ammonium chloride".