The Principality of Transylvania was a semi-independent state ruled primarily by Hungarian princes. Its territory, in addition to the traditional Transylvanian lands, also included the other major component called Partium, which was in some periods comparable in size with Transylvania proper. The establishment of the principality was connected to the Treaty of Speyer. However, Stephen Báthory's status as king of Poland also helped to phase in the name Principality of Transylvania. Although the principality was essentially independent, it existed as an Ottoman vassal state for the majority of the 16th and 17th centuries, overseen by Ottoman Turkish sultans but ruled by Hungarian princes. At various points during this period, the Habsburgs also exerted a degree of suzerainty in the region.

Ottoman Hungary encompassed those parts of the Kingdom of Hungary which were under the rule of the Ottoman Empire from the occupation of Buda in 1541 for more than 150 years, until the liberation of the area under Habsburg leadership (1686–1699). The territory was incorporated into the empire, under the name Macaristan. For most of its duration, Ottoman Hungary covered Southern Transdanubia and almost the entire region of the Great Hungarian Plain.