求翻译：The origin of this holiday is uncertain but according to one story it gets its name from a Christian named Valentine who lived in Rome during the 3rd century A.D. His job was to perform marriages for Christian couples. Unfortunately the emperor of Rome did not allow Christian marriages. So they had to be performed in secret. Finally Valentine was arrested and put into prison. While he was in prison he fell in love with the daughter of the prison guard. After one year the emperor offered to release valentine if he would stop performing Christian marriages. Valentine refused and so he was killed on February, 270 Ad. Before he was killed, he sent a love letter to the daughter of the prison guard. He signed the letter “from your Valentine”. That was the first Valentine.是什么意思？

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