According to the New Catholic Encyclopedia, celebrating Christmas was first mentioned "in the Chronograph of Philocalus, a Roman almanac whose source material can be dated to 336 [C.E.]."
Hi ku ya hi New Catholic Encyclopedia, Khisimusi yi boxiwe ro sungula "eka Chronograph ya Philocalus, ku nga buku ya Makhatoliki leyi tsariweke hi 336 [C.E.]."