I thought I should mention him though - since he is a saint - although there are several Valentines, three commemorated in the old martyrology on February 14. I know the Roman Church celebrates Cyril and Methodius on this date, therefore I assume St. Valentine is no longer celebrated universally. The 'holiday' in the U.S. is little more than a spectacle of sentimental camp and romance.
I chose this picture of St. Valentine as patron of epileptics. He is depicted healing an epileptic young man.