Treaty of Constantinople (1533)

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The Treaty of Istanbul (Turkish : İstanbul antlaşması) was signed on 22 July 1533 in Constantinople (Istanbul) by the Ottoman Empire and the Archduchy of Austria.



During the Battle of Mohács in 1526 the king of Hungary, Louis II, had died without an heir to throne, but since the Ottoman Empire did not annex Hungary after the war, the Hungarian throne was left vacant for several months. [1] Two claimants emerged: Ferdinand I, the archduke of Austria; and János Szapolyai, the voivode (governor) of Transylvania (Turkish : Erdel, now the west of Romania). Although Szapolyai was backed by most of the Hungarian elite, Ferdinand declared himself the legal king of Hungary, with the support of his older brother, Charles V, Holy Roman Emperor. The Ottoman Empire, however, backed Szapolyai, and Emperor Suleyman I mounted a threat against Austria in two military campaigns (of 1529 and 1532). Ferdinand saw that it was impossible to establish his rule in Hungary.

Meanwhile, the shah of Safavid Persia, Tahmasp I, became active in the eastern borders of the Ottoman Empire. Suleyman decided to concentrate his activities in the east and to give up his pursuit of hostilities in the west [2] and so the treaty was signed.


The terms of the treaty were as follows:


Peace was violated with the 1537 Battle of Gorjani and the 1538 Battle of Preveza.

Szapolyai had no son, and according to the Treaty of Nagyvárad, signed in 1538, Ferdinand was the heir to the throne. However, after the treaty, Szapolyai's wife gave birth to a son. In 1540, when Szapolyai died of natural causes, Ferdinand reclaimed the throne, and the war was renewed. [5] This time, Suleyman reversed his policy of allowing Hungary to persist as a vassal kingdom and annexed most of Hungary in his two campaigns in 1541 and 1543. Szapolyai's infant son was transferred to Transylvania, his father's former principality.

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  1. Prof.Dr Yaşar Yücel-Prof.Dr Ali Sevim:Türkiye tarihi II, AKDTYK Yayınları, İstanbul,1990 pp 268–274
  2. Lord Kinross :The Ottoman centuries, (Trans.Meral Gaspıralı) Altın Kitaplar, İstanbul, 2008, ISBN   978-975-21-0955-1, p.193
  3. Nicolae Jorga: Gescchiste des Osmanichen, (trans: Nilüfer Epçeli) Yeditepe Yayınları, 2009, ISBN   978-975-6480-19-9 volII,p.350-351
  4. Stanford Shaw: History of the Ottoman Empire and Modern Turkey, Cambridge University Press, ISBN 0 521 29163 1, 1976 p.94
  5. Encyclopædia Britannica, Expo 70 ed., Vol 9, p 177