ENThe article addresses anew the problem of the Teutonic Order’s significance in the Union of Horodło based on the latest research and presents various crisis aspects of the Teutonic Order and its state in Prussia after 1410, with particular emphasis of the policy of incorporation in 1411–1413. The study justifies the thesis that despite the signatories’ declarations, Poland and Lithuania were not threatened by the Order, but they in fact had aggressive plans against it. Lithuania’s incorporation to Poland made sense in terms of consolidation and its anti-Teutonic stylistics reflected the attitudes expressed at the meeting in Horodło. Keywords: Teutonic Order; Union of Horodło; Lithuania; Poland.