William Johnson, British Superintendent of Indian Affairs. From 1755 to 1774, Sir William Johnson served as Britain's Superintendent of Indian Affairs for the Northern Department of North America. He lived among the Iroquois and nurtured their loyalties to the Crown. He presented this certificate to Iroquois who demonstrated loyalty to his Britannic Majesty's interest." William Johnson, 1st Baronet (1715 - July 11, 1774) was an Anglo-Irish official of the British Empire. As a young man, Johnson moved to the Province of New York to manage an estate purchased by his uncle, Admiral Peter Warren, which was located amidst the Mohawk, one of the Six Nations of the Iroquois League. Johnson learned the Mohawk language and Iroquois customs, and was appointed the British agent to the Iroquois. Because of his success, he was appointed in 1756 as British Superintendent of Indian Affairs for the northern colonies. Johnson commanded Iroquois and colonial militia forces during the French and Indian War, the North American theater of the Seven Years War (1754-1763) in Europe. His role in the British victory at the Battle of Lake George in 1755 earned him a baronetcy; his capture of Fort Niagara from the French in 1759 brought him additional renown. He died from a stroke in 1774 during an Indian conference.