List of campaigns of Suleiman the Magnificent
The imperial campaigns (, "sefer-i humāyūn") of Suleiman the Magnificent were a series of campaigns led by Suleiman, who was the tenth and longest-reigning Sultan of the Ottoman Empire. He is known in the Western world as "Suleiman the Magnificent", and in the East as "the Lawgiver" (), for his complete reconstruction of the Ottoman legal system. During his reign from 1520 to his death in 1566, the Ottoman Empire became the most powerful state in the world. At its height, the Empire stretched from Hungary to Yemen.
Suleiman I's campaign of 1529
Suleiman's march to Vienna was also an attempt to assist his vassal, John Szapolyai who claimed the throne of Hungary. Suleiman sent his army of 120,000 strong north on the 10 May 1529 . His campaign was marked by speedy success- on September 8 Buda surrendered to the Ottomans and John Szapolyai was installed as King of Hungary. Suleiman then went further taking Gran, Tata, Komárom and Raab so that much of Ferdinand I's gains the previous two years were lost. On 27 September, Suleiman reached Vienna.