There is no doubt that at least one Saint Valentine existed, in fact, there are about 14 recognized by the Church. Confusion arises because two of these Valentines suffered martyrdom in Rome about the same time under Roman Emperor Claudius II Gothicus. One was a priest working in Rome and the second was Valentine the Bishop of Interamna, Terni, in Italy, who happened to be in Rome on Church business at the time. Their lives had become so intertwined and embellished by hagiographers over the years that it became impossible to separate them and the stories circulating. What was truth and what was legend? In 1969, due to this confusion, Saint Valentine was removed from the Calendar of Saints. His cult has not been suppressed so veneration is still allowed. However, any saint undergoing martyrdom for their faith is most worthy of veneration even if the whole story remains shrouded in mystery and legend. And, yes, Valentine, whichever saint he was, had to have been a good person or he would not have the title 'saint.'
There are a number of St. Valentines, you may read about them at the link for Saints and Angels. A person is declared a saint because they are in heaven, thus they had to lead a good life in conformity with God's Will for them to be in heaven in the first place. Everything beyond that is subjective, and at this great distance in time, the particulars about these particular men is sparse.
The Saints and Angels site has brief histories for the following saints:
Bl. Valentin Paquay (d. 1805)
St. Valentina & Thea (d. 308)
St. Valentine (d. 269) - St. Valentine of popular culture
Pope Valentine (death 827)
St. Valentine (d. 305, July 16))
St. Valentine (d. 305, December 16)
St. Valentine (d. 307 May 2))
St. Valentine (4th century, September 2)
St. Valentine (January 9, 470)
St. Valentine (with Germanus, martyred in Alexandria, 29 April)
St. Valentine Berrio-Ochoa(November 1, 1861)
St. Valentine and Dubatatius (Were executed for their faith at Carthage, November 17)
St. Valentine & Hilary (November 4, 304)
St. Valentinian (November 3, 500)
Of course! A patron saint of lovers has to be good, even if we do not know if he ever really existed.
February 14 is the feast day of Saint Valentine of Rome.
Saint Valentine of Rome is the patron saint of lovers.
Saint valentine
St. Valentine did not create the valentine. That is a relatively modern invention by somebody wishing to cash in on the saint's good name.
Valentines day was named after Saint Valentine.
Saint Valentine was a priest in Rome.
Saint Valentine of Rome
The feast day of Saint Valentine of Rome is on February 14. He is considered the patron saint of lovers.
Saint Valentine of Rome was probably not married.
We have no record of any family Saint Valentine may have had.
Saint Valentine of Rome was from Rome.
Saint Valentine of Rome lived in the third century.