Tradition / Region: Greek Mythology, Roman Mythology, Italian Mythology
Alternative names: Rhogalida / Grape-Spider
Category: Spider
The Myth
The Rhox was a terrifying venomous creature described in ancient Greek and Roman writings. It was usually identified as a spider or phalangion, though its exact nature remains uncertain. Ancient authors associated it with Libya, while similar creatures were also known around the Mediterranean, especially on the island of Crete.
The creature was dark smoky-black or pitch black in color. It possessed a strange mouth lined with teeth in the middle of its body and had short, stubby legs that moved one after another. Although ancient writers called it a spider, these unusual features have led some to believe it may have resembled a centipede or another venomous arthropod instead.
The Rhox was feared for its extraordinarily deadly venom. Ancient physicians claimed that its bite could kill almost immediately, and one of its most unusual symptoms was the appearance of thread-like strands resembling spider webs in the victim’s urine.
Because of its appearance and the lethal effects of its poison, some modern scholars believe the Rhox may have been inspired by the Mediterranean black widow, whose venom was well known throughout antiquity.
Whether it was a true spider or another poisonous creature, the Rhox remained one of the most feared venomous beasts recorded by the natural historians of the ancient Mediterranean.
Sources
A Book of Creatures. (2020, July 6). Rhox. Retrieved June 28, 2026, from https://abookofcreatures.com/2020/07/06/rhox/