"Roses Are Red" is the name of a love poem and children's rhyme with Roud Folk Song Index number 19798. It has become a cliché for Valentine's Day, and has spawned multiple humorous and parodic variants.
William Wallace Denslow's illustrations for "The rose is red", from a 1901 edition of Mother Goose
Valentine's Day, also called Saint Valentine's Day or the Feast of Saint Valentine, is celebrated annually on February 14. It originated as a Christian feast day honoring a martyr named Valentine, and through later folk traditions it has also become a significant cultural, religious and commercial celebration of romance and love in many regions of the world.
A Valentine's card, c. 1909
Saint Valentine
Shrine of St. Valentine in Whitefriar Street Carmelite Church in Dublin, Ireland
St Valentine baptizing St Lucilla, Jacopo Bassano.