Dydd Santes Dwynwen / Dydd Sant Ffolant A great card in Welsh to give to your loved ones Dydd Santes Dwynwen is the Welsh St Valentines Day and occurs on the 25th of January. And luckily, Dydd St Ffolant is St Valentines on the 14th of February. Warm up someone's heart by sending them a card on one or both of these special days. Card is supplied with a white envelope and is approx. 17.5 cm x 12.5 cm. Danfonwch gerdyn i dwymo'r galon ar ddydd Santed Dwynwen ney dydd Sant Ffolant. Carden,gydag amlen, maint 17.5 cm x 12.5 cm.