The faun festival was originally an ancient festival to commemorate a Roman faun Lupocus. On February 6th every year, that is, 438+05, people celebrate this festival in Lupus Cave on the hill of Belem Town. The rise of Christianity makes people's custom of commemorating gods gradually indifferent.
The priests didn't want people to give up the joy of the festival, so they changed the festival of faun to Valentine's Day and moved it to February 14.