St. Valentine’s Day is an official feast in the Lutheran Church and in the Anglican Communion. The feast is also celebrated in the Eastern Orthodox Church… on July 6th.
Who knew? Wikipedia did! It also tells us:
the most popular martyrology associated with Saint Valentine was that he was imprisoned for performing weddings for soldiers who were forbidden to marry and for ministering to Christians, who were persecuted under the Roman Empire; during his imprisonment, he is said to have healed the daughter of his jailer Asterius. Legend states that before his execution he wrote “from your Valentine” as a farewell to her.
Now we know more about Valentine’s Day than 95% of the population.