From Roman beginnings to the Catholic church and medieval poets to cryptic messages through flowers, how Valentine's Day became a day intertwined with card giving is a deeply woven history.
The Heart of the Matter: A History of Valentine Cards — Google Arts & Culture
Valentine's Day Cards - A History Lesson - Rare Bird Antiques
The Ultimate Guide to Valentine's Day Cards
Harbor Springs Area Historical Society
Origin of Valentine's Day Cards
Earnest or playful, that Valentine's card has a history
Ben Kling's Historical Valentines are Pun-Tastic
History Of Valentine's Day: When Was It First Celebrated, & When Was The First Card?
The mysterious origin of Valentine's Day - The Utah Statesman
Valentine's Day Cards Selection : Make Your Significant Other Feel