Actually it looks as if there were 3 St. Valentines during history. Even though no one is quite sure where he came form or which one he was is still a mystery. Legend has it that he fell in love with his Jailers daughter and cured her blindness. Another legend says he sent a note saying "from your Valentine". There is also a belief in early Europe that during the Middle Ages birds chose their partners in the middle of February making this day dedicated to love. People observed this day by writing love letters and sending small gifts to their paramours or lovers. Another legend has it that the Duke of Orleans sent the first Valentine to his wife in 1415 while he was imprisoned in the Tower of London.
So, who is this Valentinus? The name Valentinus was a popular name back in the day and it means Worthy.
The creation of the feast might have been conceived to supersede the pagan holiday Lupercalia. Until 1969 the Catholic church recognized a total of 10-11 Valentine's Days. These include Jan 7, May 2, July 16, Aug 31, Sep 2, Oct 25, Nov 1/3, Nov 11, Nov 13, and Dec 16. This saints feast was celebrated
on February 14th by the Catholic Church. In 1969 the Roman Catholics revised their calendar and he was then taken off.