Crusader-Era Ceramic Hand Grenade (11th–12th Century Jerusalem)

Crusader-Era Ceramic Hand Grenade (11th–12th Century Jerusalem)

During archaeological excavations in Jerusalem's Armenian Garden, researchers recovered sherds of medieval spheroconical ceramic vessels dating from the 11th to 12th centuries (Crusader and Ayyubid periods). Long cataloged ambiguously as perfume flasks (unguentaria), mercury containers, or beer vessels, a landmark 2022 residue study led by Dr. Carney Matheson (Griffith University) confirmed that a specific subset of these heavy-walled, turnip-shaped containers functioned as explosive and incendiary hand grenades.

Key findings from the archaeological and residue analyses include:

• Internal Chemical Residue: Residue analysis from Vessel 737 revealed traces of a unique, locally compounded explosive and propellant mixture containing sulfur, mercury, magnesium, potassium, aluminum, nitrates, phosphorus, and fatty acids, sealed with conifer resin.

• Structural Design: Unlike light, thin-walled storage ceramics, these weapons were manufactured with heavy, dense earthenware walls (typically 3–16 mm thick) engineered to contain internal pressure until catastrophic detonation, creating shrapnel.

• Form & Dimensions: The vessels feature a spheroconical, turnip-shaped profile with relief-patterned ribbed or pinecone exterior facets that provided grip during deployment. They typically range from 80 to 130 mm in height and 20 to 200 mm in diameter, tapering to a narrow neck aperture (3–10 mm) designed to hold a slow-burning fuse plug.

• Tactical Context: Historical accounts from the Crusades document the deployment of handheld ceramic incendiary devices ("pots of fire" or early grenades) thrown from siege engines and ramparts to break infantry charges and ignite fortifications.