Vassal States were a number of tributary or vassal states, usually on the periphery of the Ottoman Empire under suzerainty of the Porte, over which direct control was not established, for various reasons.
Some of these states served as buffer states between the Ottomans and Christianity in Europe or Shi’ism in Asia. Their number varied over time but notable were the Khanate of Crimea, Wallachia, Moldavia, Transylvania. Other states such as Bulgaria, the Eastern Hungarian Kingdom, the Serbian Despotate, and the Bosnia were vassals before being absorbed entirely or partially into the Empire. Still others had commercial value such as Imeretia, Mingrelia, Chios, the Duchy of Naxos, and the Republic of Ragusa (Dubrovnik). Areas such as holy cities and Venetian tributary areas of Cyprus and Zante were not fully incorporated either. Finally, some small areas such as Montenegro/Zeta and Mount Lebanon did not merit the effort of conquest and were not fully subordinated to the center. The Principality of Serbia again became a tributary in 1817, after being so in the 15th century prior to the fall of Smederevo and its annexation to the Ottoman Empire.
- Some states within the eyalet system included sancakbeys who were local to their sanjak or who inherited their position (e.g., Samtskhe, some Kurdish sanjaks), areas that were permitted to elect their own leaders (e.g., areas of Albania, Epirus, and Morea (Mani Peninsula was nominally a part of Aegean Islands Province but Maniot beys were tributary vassals of the Porte.)), or de facto independent eyalets (e.g., the Barbaresque 'regencies' Algiers, Tunis, Tripolitania in the Maghreb, and later the Khedivate of Egypt).
- Outside the eyalet system were states such as Moldavia, Wallachia and Transylvania which paid tribute to the Ottomans and over which the Porte had the right to nominate or depose the ruler, garrison rights, and foreign policy control. They were considered by the Otomans as part of Dar al-'Ahd, thus they were allowed to preserve their self-rule, and were not under Islamic law, like the empire proper; Ottoman subjects were not allowed to settle the land permanently or to build mosques.
- Some states such as Ragusa paid tribute for the entirety of their territory and recognized Ottoman suzerainty.
- Others such as the sharif of Mecca recognized Ottoman suzerainty but were subsidized by the Porte.
There were also secondary vassals such as the Nogai Horde and the Circassians who were (at least nominally) vassals of the khans of Crimea, or some Berbers and Arabs who paid tribute to the North African beylerbeyis, who were in turn Ottoman vassals themselves.
Other states paid tribute for possessions that were legally bound to the Ottoman Empire but not possessed by the Ottomans such as the Habsburgs for parts of Royal Hungary or Venice for Zante.
Other tribute from foreign powers included a kind of “protection money” sometimes called a horde tax (similar to the Danegeld) paid by Russia or the Polish-Lithuanian Commonwealth. It was usually paid to the Ottoman vassal khans of Crimea rather than to the Ottoman sultan directly.
Map showing some vassal states of the Ottoman Empire in 1683
- Byzantine Empire, ca. 1372–1403 as a vassal state, tributary from 1424 on.
- Principality of Wallachia (Eflâk Prensliği), 1395–1397, 1417–1861 with some interruptions; briefly annexed as an eyalet from 1521–22 and 1595–96)
- Serbian Despotate (ca. 1402–1459)
- Principality of Moldavia (Boğdan Prensliği), 1456–1457, 1503–1861 with some interruptions; briefly annexed as an eyalet from 1595–96)
- Sharifate of Mecca, 1517-1803
- Holy Roman Empire, 1533–1606, nominal vassal
- Crimean Khanate (Kırım Hanlığı), 1478–1774
- Kazan Khanate (Kazan Hanlığı), 1523: Kazan briefly conquered by Crimean Khanate, Sahib I Giray enthroned as Khan
- Eastern Hungarian Kingdom
- Principality of Transylvania (Erdel), 1570–1692 with some interruptions
- Sultanate of Aceh, 1569-late 18th century
- Kingdom of Bohemia, briefly in 1620 under Frederick I of Bohemia
- Principality of Upper Hungary (modern-day Slovakia), 1682–1685 under Imre Thököly
- Principality of Serbia (Sırbistan Prensliği), 1817–1830; further autonomy 1833–1878
- United Principalities of Romania (Romanya Prensliği), 1862–1877
- Khedivate of Egypt (Mısır), 1867–1914: de jure under Ottoman suzerainty, in effect fully autonomous, and from 1882 a British protectorate; broke away from Ottoman suzerainty upon Ottoman entry into World War I as the Sultanate of Egypt.
- Principality of Bulgaria (Bulgaristan Prensliği), 1878–1908
- Republic of Ragusa
- Duchy of Naxos
- Principality of Samos (Sisam), 1835–1912: established as an autonomous tributary principality under a Christian governor; annexed to Greece during the First Balkan War
- Eastern Rumelia (Doğu Rumeli), 1878–1885: established by the Treaty of Berlin on 13 July 1878 as an autonomous province; joined to the tributary Principality of Bulgaria on 6 September 1885 but remained de jure under Ottoman suzerainty; independent along with the rest of Bulgaria on 5 October 1908.
- Cyprus (Kıbrıs), 1878–1914: established as a British protectorate under Ottoman suzerainty with the Cyprus Convention of 4 June 1878; annexed by Britain upon Ottoman entry into World War I.
- Qatar (Katar), 1872–1913
- Cretan State (Girit), 1898–1912/13: established as an internationally supervised tributary state headed by a Christian governor; in 1908 the Cretan parliament unilaterally declared union with Greece; the island was occupied by Greece in 1912, and de jure annexed in 1913
- Cossack Hetmanate: Right-bank Ukraine under the rule of Petro Doroshenko (1669—1675)
See also 
- ^ Romanian historian Florin Constantiniu points out that, on crossing into Wallachia, foreign travelers used to notice hearing church bells in every village, which were forbidden by Islamic law in the Ottoman empire. Constantiniu, Florin (2006). O istorie sinceră a poporului român [A sincere history of the Romanian people] (IV ed.). Univers Enciclopedic Gold. pp. 115–118.
- ^ http://books.google.com/books?id=8gs4AAAAIAAJ
- ^ Constantinople 1453: the end of Byzantium p.10
- ^ http://books.google.com/books?id=8gs4AAAAIAAJ
- ^ http://books.google.com/books?id=LOln4TGdDHYC&pg=PA113&dq=ferdinand+I+ottoman+vassal&hl=en&ei=eTTbTuTPCKfv0gGM8p34DQ&sa=X&oi=book_result&ct=result&resnum=4&ved=0CEsQ6AEwAw#v=onepage&q=ferdinand%20I%20ottoman%20vassal&f=false
- ^ "The Tatar Khanate of Crimea". All Empires. Retrieved 9 October 2010.
- ^ Palabiyik, Hamit, Turkish Public Administration: From Tradition to the Modern Age, (Ankara, 2008), 84.
- ^ Ismail Hakki Goksoy. Ottoman-Aceh Relations According to the Turkish Sources.
- ^ http://books.google.com/books?id=XgtpAl8HzjcC&pg=PA294&dq=Frederick+wrote+to+the+sultan+on+12+July,+making+Bohemia+a+tributary+state+of+the+Ottoman+empire&hl=en&ei=-fG1Tvv1FIHd0QGZnoTSBw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CC4Q6AEwAA#v=onepage&q=Frederick%20wrote%20to%20the%20sultan%20on%2012%20July%2C%20making%20Bohemia%20a%20tributary%20state%20of%20the%20Ottoman%20empire&f=false
- ^ http://www.tacitus.nu/historical-atlas/regents/balkan/transylvania.htm