The 115,000 priests on French territory in 1789 belonged to an evolving tradition of priesthood. The challenge of making sense of the Christian tradition can be formidable in any era, but this was especially true for those priests required at the very beginning of 1791 to take an oath of loyalty to the new government--and thereby accept the religious reforms promoted in a new Civil Constitution of the Clergy. More than half did so at the beginning, and those who were subsequently consecrated bishops became the new official hierarchy of France. In Priests of the French Revolution,...