The Winchester Historical Society on Feb. 4 is scheduled to present an illustrated lecture on northern slavery at the Royall House, an estate in neighboring Medford. Refreshments will be served starting at 7 p.m., with the program to follow at 7:30 at the Sanborn House Historical and Cultural Center, 15 High St. The program is free and open to the public. Tom Lincoln, executive director of the Royall House and Slave Quarters, will talk about slavery in Colonial Massachusetts using the Royalls’ estate, located just south of the Mystic River, as a historical lens. The stories, architecture, furnishings, and archaeological artifacts in Medford bear witness to the intertwined strands of wealth and bondage. The Slave Quarters is the only remaining structure of its kind in the northern United States, and the Royall House is among the finest Colonial-era buildings in New England. Both are open for public tours from mid-May to the end of October. For more information on the Royall House and Slave Quarters, visit www.royallhouse.org. To learn more about the Winchester Historical Society, visit www.winchesterhistoricalsociety.org.