The birthdate of the wife of Valentinus, a wealthy Roman in 324 AD, was the reason Christmas is celebrated on the twenty-fifth of December, even though we know that Jesus was born in the fall, not in the winter. When Valentinus commissioned the calligrapher Furius Dionysius Filocalus to produce his calendar, he told Filocalus to put Christmas on his wife’s birthday. Valentinus hated her with a passion and wanted her birthday to be ignored.