One day the king, who was angry that valentine was so popular, put him in jail and sentenced him to death. A little girl wrote a letter to him before he died, telling him how much she loved him. This was the first valentine card. The pope decided that valentine was a saint, and said that valentine's day would be a day to celebrate christians who love each other. Over the years it became a special day for boyfriends and girlfriends, and husbands and wives