Legio XI Claudia ("Claudius' Eleventh Legion") was a legion of the Imperial Roman army. The legion was levied by Julius Caesar for his campaign against the Nervii. XI Claudia dates back to the two legions (the other was the XIIth) recruited by Julius Caesar to invade Gallia in 58 BC, and it existed at least until the early 5th century, guarding lower Danube in Durostorum (modern Silistra, Bulgaria).
Charax (Ancient Greek: Χάραξ, gen.: Χάρακος) is the largest Roman military settlement excavated in the Crimea. It was sited on a four-hectare area at the western ridge of Ai-Todor, close to the modern tourist attraction of Swallow's Nest.
The military camp was founded under Vespasian with the intention of protecting Chersonesus and other Bosporean trade emporiums from the Scythians. By the end of the 1st century AD, the Roman forces were evacuated from the peninsula. Several decades later the camp was restored by a vexillatio of the Legio I Italica; it hosted a detachment of the Legio XI Claudia at the end of the 2nd century. The camp was abandoned by the Romans in the mid-3rd century.