The festival was celebrated as a spring festival. Each young man drew a slip. Legend has it that the holiday became Valentine's Day after a priest named Valentine. Valentine was a priest in Rome at the time Christianity was a new religion. Valentine defied the Emperor's decree and secretly married the young couples. Valentine was beheaded on February 14th, the eve of the Roman holiday Lupercalia. After his death, Valentine was named a saint. As Rome became more Christian, the priests moved the spring holiday from the 15th of February to the 14th - Valentine's Day. Now the holiday honored Saint Valentine instead of Lupercus.
One legend contends that Valentine was a priest who served during the third century in Rome. When Emperor Claudius II decided that single men made better soldiers than those with wives and families, he outlawed marriage for young men -- his crop of potential soldiers.
Valentine, realizing the injustice of the decree, defied Claudius and continued to perform marriages for young lovers in secret. When Valentine's actions were discovered, Claudius ordered that he be put to death.