Acta Sanctorum is a principal source for research into the societies and cultures of early Christian and medieval Europe. Our knowledge of this period relies heavily on hagiographical literature, and specifically on this monumental collection of texts, published over a period of 300 years by the Société des Bollandistes. The Acta Sanctorum Database contains the complete texts of the 68 printed volumes, from the two January volumes (published in 1643 to the Propylaeum of December published in 1940.