Marcus Aurelius, followed about the year of our Lord 161, a man of nature more stern and severe; and, although in study of philosophy and in civil government no less commendable, yet, toward the Christians sharp and fierce; by whom was moved the fourth persecution. The cruelties used in this persecution were such that many of the spectators shuddered with horror at the sight, and were astonished at the intrepidity of the sufferers. Some of the martyrs were obliged to pass, with their already wounded feet, over thorns, nails, sharp shells, etc. upon their points, others were scourged until their sinews and veins lay bare, and after suffering the most excruciating tortures that could be devised, they were destroyed by the most terrible deaths.

Fox History Book of Martyrs