Three saints named Valentine are mentioned in early martyrologies. The third was an African martyr of whom we know almost nothing. The first two, St. Valentine of Rome and St. Valentine of Terni, are probably identical. One is called a priest, the other a bishop. Both were imprisoned, beaten, beheaded, and buried along the Flaminian Way in the second half of the second century. Article also includes a little history of St. Valentines's Day.

Hagiography of St. Valentine of Terni, followed by the story of St. Valentine of Rome. As you will see, they are suspiciously similar.

AmericanCatholic.org article relating the origins and evolution of St. Valentine's Day, along with a short explanation of why the Catholic Church no longer officially celebrates the day.

Profile of St. Valentine. Illustrated, and with links.

Short, entertaining essay on St. Valentine, third-century bishop of Terni and martyr, and his feast day.