Saints Cyril and Methodius cards and flowers today.)
Holy Mass is the Thursday after Ash Wednesday, the second of the 40 days in Lent (the 40 day calculation excludes Sundays of course). A second collect, secret and postcommunion commemorating Saint Valentine, priest and martyr, is said at TLMs.
Saint Valentine, who was martyred around 269 and buried on the Via Flaminia in Rome, had a basilica constructed in his name less than 100 years after his death. Saint Augustine of Hippo delivered a brief sermon on Saint Valentine (Sermo 44 de Sanctis), focusing not on love or charity, but on patience.