He was appointed by King George III of Britain as Lieutenant Governor of Bermuda (or Somers Isles) in America, and Commander in Chief of Forts King's Castle, Fort Hamilton, Fort Popple and Fort Paget on February 26, 1787.
In Dominica, most of the inhabitants there regarded him as the savior from the French who several times tried uprisings.
While still Governor of Dominica, he died in Antigua where he had gone for treatment because of his declining health.
He was unique in British colonial history - the only Governor of three separate places, especially popular in the last two.
Henry's father was the third son of Viscount Boyle, a member of the Irish Parliament and Collector of the port of Queenstown (now Cork). He was commissioned into the 15th Regiment of Foot in the British Army.
He earned distinction in British victories at the battles of Louisburg and Quebec in the Seven Years War (French and Indian War in the USA).