What pagan holiday falls on December 25?
Saturnalia fell on December 16-18, according to Macrobius, which was a Saturnalia observant. (see “Macrobius (±430 M): Saturnalia was held on Desember 16-18 “)
Birth of Roman Sol fell on Winter Solstice. In 1-5 AD centuries, Winter Solstice fell on December 19-23. (see “Winter Solstice in 1-5 AD centuries fell on December 19-23“)