The Ottomans (1281–1566)

Osman I, ruling from around 1299 to 1324 — the beylik is named after him ('Osmanli').

A small Turkish frontier principality ruled by a bey; the Ottoman state began as one of many rival beyliks in Anatolia.

Ghaza is holy war to expand Islam's frontiers; framing expansion against Byzantium as ghaza attracted volunteer fighters and gave the Ottomans religious legitimacy.

Bursa — it became the first real Ottoman capital, giving the state a proper administrative base.

An earthquake damaged Gallipoli's walls; Ottoman forces crossed into Europe and seized it, giving the Ottomans their first permanent foothold in the Balkans and making them a transcontinental power.

A levy of Christian boys from the Balkans, taken and trained for Ottoman military or administrative service (producing the elite Janissary soldiers), personally loyal to the sultan.

Murad I defeated a Serbian-led coalition, breaking Serbian power in the Balkans, though Murad was killed during the battle.

Bayezid I was defeated and captured by Timur (Tamerlane), plunging the Ottoman state into a decade of civil war — showing Ottoman power was not yet unstoppable.

Europe: faced a permanent new military threat, a collapsing Byzantine buffer, and failed coalitions like Nicopolis (1396). Muslim lands: gained a unifying power that absorbed rival beyliks and offered new religious/political leadership after the 'Abbasid collapse (1258).

1) Build Rumeli Hisari fortress to block naval reinforcement. 2) Bring huge cannons (built by Orban) to break the walls. 3) Besiege with ~80,000 troops vs ~7,000–8,000 defenders. 4) Haul ships overland past the harbour chain. 5) Breach the walls and take the city, 29 May 1453.

It gave the Ottomans an imperial capital (renamed Istanbul) straddling Europe and Asia, ended 1,100 years of Byzantine rule, and pushed the Ottomans from a ghazi frontier state toward a fully institutionalised empire under Mehmet II ('the Conqueror').

Long-term (e.g. Byzantine decline, gunpowder development), short-term (e.g. Mehmet II's 1451 accession and ambition), and immediate/trigger (e.g. specific 1453 siege tactics like overland ship-hauling).

29 May 1453, ending the Byzantine Empire.

Ships were dragged overland on greased logs at night into the Golden Horn.

Kayser-i Rum (Caesar of Rome) — to claim Roman/Byzantine imperial legitimacy.

Selim I, at Marj Dabiq (1516) and Ridaniya (1517).

Caliph — leader of the wider Sunni Muslim world.

The recruitment of Christian boys from the Balkans, converted to Islam and trained for the sultan's army or bureaucracy.

A system organising non-Muslim religious communities (Orthodox, Jewish, Armenian) into self-governing groups under Ottoman rule.

Sharia was Islamic religious law; kanun was the sultan's own secular law code. The two operated together to govern a diverse empire.

Mohacs (1526) against Hungary, and the siege of Vienna (1529).

Suleiman's admiral who made the Ottoman navy dominant across the Mediterranean.

Because he issued kanunnames standardising taxation, land tenure and criminal law across the empire's provinces.

Mehmet II: conquest and transformation (Constantinople, new imperial identity). Suleiman: consolidation and peak power (law codes, culture, naval dominance).