Who was St. Valentine and what is he known for according to the article?

According to the article, St. Valentine was a Christian martyr who lived in the third century AD. He was a priest in Rome during the reign of Emperor Claudius II, who had prohibited marriage for young men because he believed unmarried soldiers fought better than married ones. St. Valentine defied the emperor's order and performed marriages in secret. He was eventually caught, imprisoned, and executed on February 14th. St. Valentine is known for his acts of love and defiance, and he is considered the patron saint of love, young people, and happy marriages.