Most countries celebrate their national day on the date they declared independence, won a war, or became a republic. France has Bastille Day. The United States has the Fourth of July. Ireland does something different. St. Patrick's Day, held on March 17th, marks the feast day of Ireland's patron saint — the anniversary of his death in 461 AD. Not a revolution. Not a founding moment. A death. And the man being honoured wasn't even Irish. Born in Roman Britain in the late 4th c