Byzantine Empire

Alp Arslan (c. 1029-1072) was the second Seljuk sultan, whose victory over the Byzantine emperor Romanos IV at Manzikert in 1071 broke Byzantine defences in Asia Minor and opened Anatolia to Turkish settlement. He was killed the following year on campaign in Transoxiana.

The Battle of Yarmouk (636 CE) was the decisive military engagement that secured Muslim conquest of the Levant, where Khalid ibn al-Walid's tactical genius led to a crushing defeat of the Byzantine Empire and opened Syria and Palestine to Islamic rule.

The historic conquest of Constantinople by Ottoman Sultan Mehmed II on May 29, 1453 CE, ending the Byzantine Empire and establishing Ottoman dominance in southeastern Europe. This pivotal victory transformed the Ottomans into a major European power.

The conquest of Jerusalem in 638 CE by Caliph Umar ibn al-Khattab marked the peaceful Islamic liberation of the holy city, establishing principles of religious tolerance and protection that would characterize Islamic rule in Jerusalem for centuries.

Ertuğrul Ghazi was leader of the Kayı tribe of Oghuz Turks and father of Osman I, founder of the Ottoman Empire. Operating on the Seljuk-Byzantine frontier in thirteenth-century Anatolia, his modest gains at Söğüt laid the groundwork for an enduring Islamic empire.

The unprecedented territorial expansion of the Islamic empire under Caliph Umar ibn al-Khattab (634-644 CE), which transformed Islam from an Arabian state into a world power spanning three continents through the conquest of the Sassanian Empire and much of the Byzantine Empire.

Khalid ibn al-Walid (592-642 CE) was the most effective commander of the early Islamic conquests, known as the Sword of Allah after the Prophet's description of him at Mu'tah. He led Muslim forces across Arabia, Iraq, and Syria.

Mehmed II (1432-1481) took Constantinople in 1453 and spent the following three decades converting the Ottoman state into a centralised empire, codifying its law, rebuilding its new capital, and extending its rule across Anatolia, the Balkans and the Black Sea.

Orhan Ghazi (c. 1281-1362) took Bursa, Nicaea and Nicomedia from the Byzantines, made Bursa his capital, and carried the Ottomans across the Dardanelles into Europe. Under him the frontier principality acquired the coinage, institutions and territory of a state.

Osman I (c. 1258-c. 1324) was the Turkoman frontier leader from whom the Ottoman dynasty takes its name. No written source survives from his lifetime, and almost everything recorded about him was set down more than a century later, which makes his reign the least documented of the dynasty.

The Seljuk Empire (1037-1194 CE) was a powerful Turkish-Sunni dynasty that dominated the Middle East and Anatolia, defeated the Byzantine Empire at Manzikert, established Turkish power in Anatolia, and patronized the famous Nizamiyya schools.