Why is Valentine’s Day on Feb. 14? Feb. 14 was the beginning of the Roman festival called Lupercalia. Young Roman children celebrated with singing and dancing. Girls would put their name into a jar, and the boys would pull one name. The girl selected would be their partner for the Lupercalia celebrations. The festival also included the boys running with strings made of goat skins. If the skins touched the girls, it meant good luck and their future children would be healthy.
In later years, the festival was changed to honor the memory of St. Valentine.
Source: Let’s Celebrate Valentine’s Day