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Denmark. He had ambitious plans concerning the development of sea trade. With this purpose he established Friedrichstadt in 1621, in sympathy with city of Glückstadt established in 1617 by Christian IV of Denmark. Furthermore, he attempted to find a commercial way to Russia and Persia that would not pass around Africa.[citation needed] For this reason he sent on 6 November 1633 the expedition from Hamburg to Moscow under the management of a commercial agent of Otto Brüggemann and a ducal adviser, Philipp Crusius, and with Adam Olearius as secretary. On 14 August 1634 the delegation arrived at Moscow. Although it was not successful in concluding a commercial agreement with Tsar Michael I of Russia, nevertheless, immediately after the return of the delegation to Gottorp on 6 April 1635, Frederick began the preparation of the following expedition.[citation needed] In 1636, he sent his delegation to Persia, and in 1639 Safi of Persia sent a return delegation with presents for the Duke." - (en.wikipedia.org 31.01.2020)