Medieval author Geoffrey Chaucer is considered the first person to associate romantic love with Saint Valentine, although unofficially there may be others whose sources cannot be proven.
In 1382, in the Parliament of Fowls (1382), he mentions that Valentine’s Day was when birds chose their mates.
The earliest association with February 14 as an annual celebration of love appears in the Charter of the Court of Love, allegedly issued by Charles VI of France in 1400, and describes a lavish feast of the royal court.
The word Valentine then became synonymous with describing a person’s lover, with feelings committed to verse on that day. This led to the creation of mass-produced paper Valentine’s cards by the 19th century, with Valentine’s as we know it being born.