According to Catholic Online: Valentine was a holy priest in Rome, who, was caught marrying Christian couples, and with St. Marius and his family, assisted the martyrs in the persecution under Claudius II. He was apprehended, and sent by the emperor to the prefect of Rome. Claudius took a liking to this prisoner — until Valentinus made a strategic error: he tried to convert the Emperor — whereupon this priest was condemned to death. He was beaten with clubs and stoned; when that didn’t do it, he was beheaded outside the Flaminian Gate on February 14, about the year 269 or 270.
Before his execution, he was said to have converted 46 of the members of the family of the jail guards, and restored the sight of the blind daughter of his jailer.
Pope Julius I is said to have built a church near Ponte Mole to he memory, which for a long time gave name to the gate now called Porta del Popolo, formerly, Porta Valetini. The greatest part of his relics are now in the church of St. Praxedes. His name is celebrated as that of an illustrious martyr in the sacramentary of St. Gregory, the Roman Missal of Thomasius, in the calendar of F. Fronto and that of Allatius, in Bede, Usuard, Ado, Notker and all other martyrologies on this day. To abolish the heathens lewd superstitious custom of boys drawing the names of girls, in honor of their goddess Februata Juno, on the fifteenth of this month, several zealous pastors substituted the names of saints in billets given on this day.
St. Valentine is the Patron Saint of affianced couples, bee keepers, engaged couples, epilepsy, fainting, greetings, happy marriages, love, lovers, plague, travellers, young people. He is represented in pictures with birds and roses.