A king in some country declared love illegal so that he could draft soldiers without breaking hearts, but Saint Valentine was a priest, and he kept officiating weddings in secret. Eventually, the king found out, and he had St Valentine sent to jail, and he was to be executed. While in jail, St Valentine fell in love with the daughter of the warden, and on the day of his execution, he left a card for her in his cell. He was executed on February 14th.
The Valentine's Day is named after a priest who was martyr in the times of the emperor Claudius II Gothicus. The priest had fallen in love with the daughter of his jailer and signed a letter to his beloved girl with "from your Valentine." From the 14th century St. Valentine's Day has been celebrated as a day of romantic love. http://whatdayisit.net/what-day-is-valentines-day/
The ruler of Rome at the time that that unmarried men made better worriers but Valentine saw he was doing something wrong so he still performed marriages in secret but was discovered and he was put to death
Saint Valentinus was a catholic martyr who was jailed for marrying people illegally. He is believed to have saved his jailers daughter and wrote her a letter signing it with "your valentine" or something like that. He died on the 14 of Feb.