The term “rigor” comes from a Latin word meaning “stiffness”. Rigor mortis is the stiffening of a body’s muscles and joints a few hours after death. A man who shows rigor is thorough, exhaustive, and accurate. He is not flexible with the facts, soft with the truth, or fast and free with the details.
This trait serves historians well, who mustn’t be careless with the truth but diligent, not easily bent to another’s opinions. John Foxe stands as church history’s greatest martyrologist, the name for a historian who studies the lives of those who were killed for their faith. Some Christians value Foxe’s Book of Martyrs above all other human books because it details so carefully the lives and deaths of some of Church history’s greatest Christians.
Foxe was a man of courage and godliness, who showed meticulous attention to detail and, in doing so, provided the greatest record of Christian martyrs ever written.