valentine’s day was made to commemorate st. valentine a roman priest or bishop inducted as a saint in catholic religion on... well february 14, in the 3rd century. he was very well known for marrying people who weren’t supposed to get married. he’s most famous for writing a letter to a man's wife he befriended when he was jailed by christians before being killed. The letter started off with "from your valentine..." he'd be killed in the mid-3rd century.