The Nguyễn lords, also known as the Nguyễn clan, were Nguyễn dynasty's forerunner and a feudal noble clan ruling southern Đại Việt in the Revival Lê dynasty. The Nguyễn lords were members of the House of Nguyễn Phúc. The territory they ruled was known contemporarily as Đàng Trong and by the exonyms the Kingdom of Cochinchina and the Kingdom of Quảng Nam, in opposition to the Trịnh lords, who ruled northern Đại Việt as Đàng Ngoài, known as the "Kingdom of Tonkin" by Europeans and "Kingdom of An Nam" by Imperial China in bilateral diplomacy. They were officially entitled, in Sino-Vietnamese, the Nguyễn Vương in 1744 when lord Nguyễn Phúc Khoát self-proclaimed himself to elevate his status equally to Trịnh lords's title known as the Trịnh Vương. Both Nguyễn and Trịnh clans were de jure subordinates and fief of the Lê dynasty. However, the de jure submission of the Nguyễn lords to the Trịnh lords ended in 1627 sparked the war between them.