The first is that Valentine’s Day is celebrated in honor of a priest in third-century Rome.  

He married lovers in secret and was killed for treason upon discovery of this act.

when two of them fell in love, he officiated their wedding.

Some believe Valentine’s Day is celebrated on February 14

that is when Saint Valentine was killed or buried.

start on February 13 and end on February 15. 

The festival was meant to encourage a woman’s fertility and pay homage to Faunus

This was around the same time the Normans (who were Viking settlers in France)