A desire to standardise calendars eventually drove the assimilation of the NYD as the official beginning of the year. In 1066 William the Conqueror declared that January 1st a holiday and in the same 'I'll show you who's boss' spirit Pope Gregory XIII used the 1578 New Year's Day celebration to decree
that all Roman Jews, under pain of death, must listen attentively to the compulsory Catholic conversion sermon given in Roman synagogues after Friday night services.In 1582 Gregory confirmed that January 1st should be celebrated but the Protestant societies of northern Europe stuck doggedly to a March 1st start date until the late Eighteenth Century.
So an artificially imposed holiday, often used as a pretext for spot of forced religious conversion.
Happy New Year!