Newstead Abbey (nyōˈstĭd, –stĕd) [key], Nottinghamshire, central England, on the border of Sherwood Forest, between Nottingham and Mansfield. It was founded c.1170 by Henry II in atonement for the murder of Thomas à Becket. It was secularized and granted to John Byron by Henry VIII. Lord Byron lived at the abbey intermittently from 1798 to 1816; he sold it in 1818. His rooms are preserved as he left them.