Pope Caius (died 22 April 296), also called Gaius, was the Bishop of Rome from 17 December 283 to his death in 296.

Next winter, it will be sixty years since an army crossed the Rhine River bringing death and destruction the longest such period since at least the late second century B.C., when the Cimbri and Teutones challenged the army of the Roman Consul Gaius Marius in the Rhone Valley.