From History of Trumbull and Mahoning Counties, with Illustrations and Biographical Sketches (Cleveland, Ohio: H. Z. Williams & Bros., 1882), Volume 2, p. 456:
John Greenwood came from Massachusetts in 1813, locating where his son, Nathaniel C., now resides. He married Sarah Webster. They had eleven children, six only living: Nathaniel C., residing in Vienna township; Harriet, in Fowler; Morgan, in Fowler; Betsey, in Vienna; Oliver died in Indiana in 1879; Frank died in Indiana in 1880; the other children died young. Nathaniel C. Greenwood was born in Massachusetts in 1809. He married Miss Ladora A. Wright in 1833. They had four children, as follow: Leander [Leando], residing in Fowler, Hiram, in Howland; Holmes, in Vienna; Ellen Rogers, in Vienna. Mr. Greenwood followed the occupation of a gunsmith over five years. He is now engaged in farming.