A Byzantine hollow ceramic vessel with domed top and a rounded base. The vessel would have been filled with an explosive liquid known as 'Greek Fire' and used as a hand grenade. The shoulder is decorated with a sequence of curved grooves. The shoulders also feature two large protrusions. Signs of wear, include minor chips, scratches, warping and encrustations to the surface all consistent with age. Chipping to the mouth of the vessel. Greek Fire was one of the most significant military inventions in history and its use saved the Byzantine Empire for centuries from attacks. The exact formula for this flammable liquid remains a secret to this day. It was first used at sea where it was particularly effective against wooden ships, as it could not be put out by water. It was later delivered via clay grenades, either by hand or by launching with a catapult. Measurements (Circa): Length 11.5cm x Width 8cm Provenance: Ex private UK collection, acquired 1990s.