(Polish title: Historia powstania Traktatu Dobrosasiedzkiego RP - RFN z 17 czerwca 1991 r. (ze wspomnien glównego negocjatora)). The democratic transformations in Europe at the turn of the 1980s and 1990s led to the downfall of communism, the break-up of the Soviet empire and the reunification of Germany. This new framework brought about a breakthrough in the relations between the new Poland which became a democratic and sovereign state and the Federal Republic of Germany. The Good Neighbors Treaty of June 17, 1991 provided a stable international legal and political basis of the policy of accord and reconciliation between Poles and Germans. The author presents the diplomatic history of the emergence of this historic treaty in the years 1989 - 1991 (its role in Polish-German relations is comparable to that of the German-French Élysée Treaty of 1963). The main cognitive value of the article lies in the fact that besides the latest results of archival research, the author also used his own reminiscences as a diplomat (twenty years ago he was the Acting Head of the Polish Delegation for negotiating the Good Neighbors Treaty with the Germans). Professor Jerzy Sulek's more extensive study on the genesis, course and results of negotiations on the Good Neighbors Treaty can be found in a collective work Przelom i wyzwanie (Breakthrough and Challenge edited by Witold Góralski), Warszawa 2011 (in print).