Why do we celebrate Valentine's Day?

Source:https://www.youtube.com/watch?v=BaQrUe76KGk 

Source: http://www.agoramagazine.it/index.php?option=com_k2&view=item&id=23662:por-que-se-celebra-san-valentin&Itemid=731

On that day, February 14, Claudius Aurelius Marcus Gothicus, Claudius II, was established from ancient times by the history of the Roman emperor Claudius Aurelius. So much so that the priest Valentin established it on February 14 in the year 270 and therefore was declared from the year 498 by Pope Gelasius I, since that instantante is recognized by several parts of the deceased and this is based on both couples as in friendship, it can be recognized that by giving something to the other person, if this is your partner, you give them red flowers, while if it is a friendship, it is yellow, this was celebrated until 2014, the same Pope Francis had to participate in these festivities that made it official again this special event for all the people that is the reason why we celebrate Valentine's Day.

Triana, Fernanda