Dee ihe ọzọ maka paragraf a - A mụrụ Key n'April 12, 1757, na nso Charlestown, Cecil County, Mpaghara Maryland, British America, ọ gụrụ akwụkwọ. Ọ bụ onye na-eguzosi ike n'ihe n'oge American Revolutionary War, na-alụ ọgụ na ndị agha Britain
site na 1777 ruo 1781. O jere ozi na Maryland Loyalists Battalion dị ka onye isi. Ndị agha Spain jidere Key na ndị agha ya niile <unk> bụ ndị na-alụ agha na ndị Britain <unk> na Pensacola, Florida. Key bụ onye mkpọrọ otu ọnwa na Havana, Cuba tupu a tọhapụ ya ma ziga ya na New York City, New York ruo mgbe agha biri. Mgbe agha ahụ gasịrị, Key gara England wee gụchaa akwụkwọ na Middle Temple na London na 1784 wee gụọ iwu na 1785. Ọ laghachiri Maryland na 1785. A nabatara ya n'ụlọikpe ma banye ọrụ onwe ya na Leonardtown, Maryland site na 1787 ruo 1790. Ọ gara n'ihu na-arụ ọrụ onwe ya na Annapolis, Maryland site na 1790 ruo 1794, na site na 1799 ruo 1800. Ọ bụ onye otu Maryland House of Delegates site na 1794 ruo 1799. Ọ bụ Mayor nke Annapolis site na 1797 ruo 1798.