Ethan Allen (January 21, 1738 [O.S. January 10, 1737] – February 12, 1789) was an American farmer, writer, military officer, and politician. He is best known as one of the founders of Vermont and for the capture of Fort Ticonderoga during the American Revolutionary War, and was also the brother of Ira Allen and the father of Fanny Allen.
Allen was born in rural Connecticut and had a frontier upbringing, but he also received an education that included some philosophical teachings. In the late 1760s, he became interested in the New Hampshire Grants, buying land there and becoming embroiled in the legal disputes surrounding the territory. Legal setbacks led to the formation of the Green Mountain Boys, whom Allen led in a campaign of intimidation and property destruction to drive New York settlers from the Grants. He and the Patriot-aligned Green Mountain Boys seized the initiative early in the Revolutionary War and captured Fort Ticonderoga in May 1775. In September 1775, Allen led a failed attempt on Montreal which resulted in his capture by the British.