Who was St David and why does Wales celebrate him in March every year?

EACH year on March 1, Welsh people throughout the world stop to celebrate St David's Day - but, who was St David and why do we celebrate him?

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Ireland ,Aberystwyth ,Ceredigion ,United Kingdom ,Pembrokeshire ,Llanddewi Brefi ,Saint David ,Glyn Rhosyn , ,Pope Callixtus ,Saint Patrick ,