The Roman Martyrology commemorates two pope saints, Soter and Caius, separated by a century. Pope St. Soter (d. 175) was the twelfth pope, and succeeded Anicetus as Pope in 166. He died a martyr in 175, under Emperor Marcus Aurelius. Pope St. Caius (d. 296) was the 28th pope. Caius governed the Church from 283 until he died on April 22, 296. The popes of the first centuries suffered the heavy anxiety of the persecutions which continually threatened their flocks; the pontificate of Caius, however, was marked by a long period of peace, some ten years before the terrible persecution under Emperor Diocletian.