J. C. M'Coan's Protestant Endurance Under Popish Cruelty is a dramatic historical account of Protestant suffering under Catholic persecution, particularly during the Spanish Inquisition. Written with fervor and conviction, M'Coan compiles narratives of imprisonment, martyrdom, and steadfast faith in the face of institutionalized oppression. Though steeped in the polemical tone of its time, the book offers valuable documentation of religious conflict and the enduring human struggle for freedom of conscience. M'Coan's work appeals to those interested in Reformation history, religious liberty, and the moral complexities of faith under fire.