St. Valentine was a Priest near Rome in about the year 270 A.D. Claudius began calling men to go into battle with him. Many of them were unwilling to go because they were either married, had families or did not wish to leave their sweethearts. And the emperor soon became angry when he saw that the number of soldiers were too few. And so he ordered that no marriages should be celebrated and that all engagements must be broken off immediately.
Saint Valentine heard of the emperor's command and felt it was a wrong command. So when a young couple came to the Church, he secretly united them in Christian marriage. It wasn't long before the word spread, and others came and were quietly married. Valentine soon gained a reputation as a friend of lovers and sweethearts in every district of Rome. But soon enough the emperor heard about it and through him in prison.