The Treaties of Cölln and Mewe, concluded in 1454 and 1455, transferred the Neumark (New March) from the State of the Teutonic Order to the Electorate of Brandenburg. The Teutonic Knights had received the area as a pawn from Brandenburg in 1402, and as a possession in 1429. Financial shortages due to the onset of the Thirteen Years' War (1454–1466) forced Ludwig von Erlichshausen, Grand Master of the Teutonic Order, to pawn the Neumark to Frederick II, Elector of Brandenburg, by the Treaty of Cölln on 22 February 1454, and to subsequently sell it by the Treaty of Mewe on 16 September 1455.