Trịnh lords
The Trịnh lords, formally titled as Viceroy of Trịnh, also known as the House of Trịnh or the Trịnh clan, were a feudal noble clan that ruled Đàng Ngoài during the Revival Lê dynasty. The Trịnh lords were de jure subordinates of the Lê dynasty emperors but were in actuality the de facto rulers of northern Vietnam.