Osman I in the context of "Ottoman Empire"

Mongol invasions of Anatolia occurred at various times, starting with the campaign of 1241–1243 that culminated in the Battle of Köse Dağ. Real power over Anatolia was exercised by the Mongols after the Seljuks surrendered in 1243 until the fall of the Ilkhanate in 1335. Because the Seljuk sultan rebelled several times, in 1255, the Mongols swept through central and eastern Anatolia. An Ilkhanate garrison was stationed near Ankara. Remains of the Mongol cultural heritage still can be seen in Turkey, including tombs of a Mongol governor and a son of Hulagu.

By the end of the 14th century, most of Anatolia was controlled by various Anatolian beyliks due to the collapse of the Seljuk dynasty in Rum. The Turkmen beyliks were under the control of the Mongols through declining Seljuk sultans. The Beyliks did not mint coins in the names of their own leaders while they remained under the suzerainty of the Ilkhanids. The Ottoman ruler Osman I was the first Turkish ruler who minted coins in his own name in the 1320s. Since the minting of coins was a prerogative accorded in Islamic practice only to be a sovereign, it can be considered that the Ottomans became independent of the Mongol Khans.

The Ottoman Empire, also known as the Turkish Empire, controlled much of Southeast Europe, West Asia, and North Africa from the 14th century to the early 20th century. It also controlled parts of southeastern Central Europe between the early 16th and early 18th centuries.

The empire emerged from a beylik, or principality, founded in northwestern Anatolia in c. 1299 by the Turkoman tribal leader Osman I. His successors conquered much of Anatolia and had expanded into the Balkans by the mid-14th century, transforming their petty kingdom into a transcontinental empire. The Ottomans under Mehmed II brought to and end the Byzantine Empire with the conquest of Constantinople in 1453. Controlling a large part of the Mediterranean Basin, and with its capital at Constantinople, the Ottoman Empire was at the centre of interactions between the Middle East and Europe for six centuries. The empire ruled over a vast population and granted varying levels of autonomy to its many confessional communities, or millets, to manage their own affairs per Islamic law. The Ottoman Empire became a global power in the 16th century during the reign of Selim I and Suleiman the Magnificent.

The Ottoman Turks (Turkish: Osmanlı Türkleri) were a Turkic ethnic group in Anatolia. Originally from Central Asia, they migrated to Anatolia in the 13th century and founded the Ottoman Empire, in which they remained socio-politically dominant for the entirety of the six centuries that it existed. Their descendants are the present-day Turkish people, who comprise the majority of the population in the Republic of Turkey, which was established shortly after the end of World War I.

Reliable information about the early history of the Ottoman Turks remains scarce, but they take their Turkish name Osmanlı from Osman I, who founded the House of Osman alongside the Ottoman Empire; the name "Osman" was altered to "Ottoman" when it was transliterated into some European languages over time. The Ottoman principality, expanding from Söğüt, gradually began incorporating other Turkish-speaking Muslims and non-Turkish Christians into their realm. By the 1350s, they had begun crossing into Europe and eventually came to dominate the Mediterranean Sea. In 1453, the fall of Constantinople, which had served as the capital city of the Byzantine Empire, enabled the Ottoman Turks to control all major land routes between Asia and Europe. This development forced Western Europeans to find other ways to trade with Asians. Following the dissolution of the Ottoman Empire, the Ottoman Turkish identity ceased to exist; the Ottoman Turkish language, which was written using the Perso-Arabic script, developed into the modern Latinized Turkish language.

Osmanoğlu family is a family belonging to the historical House of Osman, which was the ruling house of the Ottoman Empire from 1299 until the abolition of the Ottoman sultanate in 1922, and the Ottoman Caliphate from 1517 until the abolition of the caliphate in 1924. In 1924, members of the Osmanoğlu family were forced into exile. Their descendants now live in many countries throughout Europe, as well as in the United States, the Middle East, and since they have been permitted to return to their homeland, many now also live in Turkey. The female members of the dynasty were allowed to return after 1951, and the male members after 1973. The family adopted the surname of Osmanoğlu, meaning "son of Osman".

The Ottoman dynasty (Turkish: Osmanlı Hanedanı) consisted of the members of the imperial House of Osman (Ottoman Turkish: خاندان آل عثمان, romanized: Ḫānedān-ı Āl-i ʿOsmān), also known as the Ottomans (Turkish: Osmanlılar). According to Ottoman tradition, the family originated from the Kayı tribe branch of the Oghuz Turks, under the leadership of Osman I in northwestern Anatolia in the district of Bilecik, Söğüt. The Ottoman dynasty, named after Osman I, ruled the Ottoman Empire from c. 1299 to 1922.

During much of the Empire's history, the sultan was the absolute regent, head of state, and head of government, though much of the power often shifted to other officials such as the Grand Vizier. During the First (1876–78) and Second Constitutional Eras (1908–20) of the late Empire, a shift to a constitutional monarchy was enacted, with the Grand Vizier taking on a prime ministerial role as head of government and heading an elected General Assembly.

The sultans of the Ottoman Empire (Turkish: Osmanlı padişahları), who were all members of the Ottoman dynasty (House of Osman), ruled over the transcontinental empire from its perceived inception in 1299 to its dissolution in 1922. At its height, the Ottoman Empire spanned an area from Hungary in the north to Yemen in the south and from Algeria in the west to Iraq in the east. Administered at first from the city of Söğüt since before 1280 and then from the city of Bursa since 1323 or 1324, the empire's capital was moved to Adrianople (now known as Edirne in English) in 1363 following its conquest by Murad I and then to Constantinople (present-day Istanbul) in 1453 following its conquest by Mehmed II.

The Ottoman Empire's early years have been the subject of varying narratives, due to the difficulty of discerning fact from legend. The empire came into existence at the end of the 13th century, and its first ruler (and the namesake of the Empire) was Osman I. According to later, often unreliable Ottoman tradition, Osman was a descendant of the Kayı tribe of the Oghuz Turks. The eponymous Ottoman dynasty he founded endured for six centuries through the reigns of 36 sultans. The Ottoman Empire disappeared as a result of the defeat of the Central Powers, with whom it had allied itself during World War I. The partitioning of the Empire by the victorious Allies and the ensuing Turkish War of Independence led to the abolition of the sultanate in 1922 and the birth of the modern Republic of Turkey in 1922.