The gens Istacidia was an obscure Roman family at Pompeii. No members of this gens are mentioned by ancient writers, but a number are known from inscriptions. Numerius Istacidius Cilix was one of the municipal duumvirs of Pompeii around the beginning of the first century. The Istacidii were apparently the residents of the famous "Villa of the Mysteries", and a large sepulchre found along the bay road contains several tombs for members of this family.[1][2]