Lyman Beecher (October 12, 1775 - January 10, 1865) was a Presbyterian clergyman, abolitionist, and father of Harriet Beecher Stowe, Henry Ward Beecher, and Catharine Beecher. He was born in New Haven, Connecticut. Beecher attended Yale, and graduated in 1797. He spent 1798 in Yale Divinity School under the tutelage of his mentor Timothy Dwight, and was ordained a year later, in 1799. He began his religious career in Long Island. He gained popular recognition in 1806, after giving a sermon concerning the duel between Alexander Hamilton and Aaron Burr. He moved to Litchfield, Connecticut in 1810 and started to preach Calvinism. A few years later after moving to Boston's Hanover Church, he began preaching against Unitarianism, which he thought to be evil.