 Their design was prepared in 1934–1936, while Germany was negotiating the Anglo-German Naval Agreement.The treaty, signed in 1935, permitted Germany to build of heavy cruisers, enough for five 10,000-long ton ships.Of the five ships, only "Admiral Hipper", "Blücher", and "Prinz Eugen" were completed; "Seydlitz" was 95% complete when the decision was made to convert her into an aircraft carrier.