31 October 1517 is traditionally taken as the starting point for the Reformation, even if the date is controversial. But the French Reformation has no easily identifiable starting date. This article explores the successive attempts at giving the process an origin. First, an overview of the historiography of the last forty years highlights that there is no consensual starting date and that Calvin does not even appear to be the uncontroversial father of the French Reformation. Next follows a survey of the commemorations of the beginning of the Reformation from the nineteenth century onwards. They were few and far between and essentially referenced Luther and the 95 Theses, but usually quite discreetly. Sermons preached on these occasions cele...