which celebrated author invented valentine's day?
<answer> Pope Saint Gelasius invented valentine's day. <context> Valentine’s Day started in 500 A. D. It was started by Pope Saint Gelasius I, the third pope of the Catholic Church. He named the day after Saint Valentine or Saint Valentinus. The name Valentine is derived from a Latin word “valens” meaning worthy, strong or powerful. In ancient Rome a Pagan festival was celebrated and to Christianize the same, the festival was renamed as “Saint Valentine’s Day” by the church. The Valentine day took a totally different shape in the 18th century. The businessmen started generating profits by making cards associated with the festival.