LYON, MARY, an American educator; born in Buckland, Mass., Feb. 28, 1797. After more than 20 years of teaching, she founded at South Hadley, Mass., the Mount Holyoke Female Seminary, of which she was president until her death. Many of her pupils afterward established schools on the same plan. She died in South Hadley, March 5, 1849. See Mount Holyoke College.