St. Patrick 's Day is the feast day St. Patrick , patron saint of Ireland . Study : Patrick may have sold slaves in order to pay his way to Ireland to avoid tax collector job in Britain . Comment: Legend : Patrick used shamrock , national emblem of Ireland , to explain concept of Holy Trinity .
St. Patrick 's Day is the feast day St. Patrick , patron saint of Ireland . Study : Patrick may have sold slaves in order to pay his way to Ireland to avoid tax collector job in Britain . Traditional history says Patrick was abducted in Britain and taken to Ireland as a slave . Legend : Patrick used shamrock , national emblem of Ireland , to explain concept of Holy Trinity .