Rise of the Ottoman Empire
The foundation and rise of the Ottoman Empire is a period of history that started with the emergence of the Ottoman principality in , and ended with the conquest of Constantinople on May 29, 1453. This period witnessed the foundation of a political entity ruled by the Ottoman Dynasty in the northwestern Anatolian region of Bithynia, and its transformation from a small principality on the Byzantine frontier into an empire spanning the Balkans and Anatolia. For this reason, this period in the empire's history has been described as the Proto-Imperial Era. Throughout most of this period, the Ottomans were merely one of many competing states in the region, and relied upon the support of local warlords and vassals to maintain control over their realm. By the middle of the fifteenth century the Ottoman sultans were able to accumulate enough personal power and authority to establish a centralized imperial state, a process which was brought to fruition by Sultan Mehmed II (r. 1451-1481). The conquest of Constantinople in 1453 is seen as the symbolic moment when the emerging Ottoman state shifted from a mere principality into an empire, marking a major turning point in its history.
Ottoman decline thesis
The Ottoman decline thesis or Ottoman decline paradigm () refers to a now-obsolete historical narrative which once played a dominant role in the study of the history of the Ottoman Empire. According to the decline thesis, following a golden age associated with the reign of Sultan Suleiman the Magnificent (r. 1520–1566), the empire gradually entered into a period of all-encompassing stagnation and decline from which it was never able to recover, lasting until the empire's dissolution in 1923. This thesis was used throughout most of the twentieth century as the basis of both Western and Republican Turkish understanding of Ottoman history. However, by 1978, historians had begun to reexamine the fundamental assumptions of the decline thesis. After the publication of numerous new studies throughout the 1980s, 1990s, and 2000s, and the reexamination of Ottoman history through the use of previously untapped sources and methodologies, academic historians of the Ottoman Empire achieved a consensus that the entire notion of Ottoman decline was a myth – that in fact, the Ottoman Empire did not stagnate or decline at all, but rather continued to be a vigorous and dynamic state long after the death of Suleiman the Magnificent. The decline thesis has been criticized as "teleological", "regressive", "Orientalist", "simplistic", and "one-dimensional", and described as "a concept which has no place in historical analysis". Scholars have thus "learned better than to discuss [it]."