The Barony-Marche of the Debatable Lands ("BMDL") is a branch of the Society for Creative Anachronism
("SCA"), an international organization dedicated to the study and recreation of the Middle Ages and early Renaissance. The BMDL encompasses Allegheny County, Pennsylvania, including most of the Pittsburgh, PA metropolitan area. The Debatable Lands is the oldest and one of the largest baronies in the Kingdom of Æthelmearc
, the region covering western New York, most of Pennsylvania outside the Harrisburg-Philadelphia corridor, and West Virginia.