Ayyubid power was rooted in Egypt, where Salah al-Din transformed the political inheritance of the Fatimid state into a new Sunni order. The country’s stability and resources made it the heartland of Ayyubid military power, while Cairo became the focus of defensive construction and administrative organization. The dynasty’s rise followed years of intervention by Nur al-Din and conflict between the Fatimid government and the Kingdom of Jerusalem.

The dynasty’s economic and military structure rested on a system of fiefs adapted from Seljuk practice but modified for Egypt’s centralized political tradition. Holdings were assigned to Kurdish amirs, officers, and members of the ruling family, with separate provisions for personal needs and troop maintenance. The state regulated rents and created a ministry responsible for fiefs, revenues, army organization, and supplies. The system strengthened agricultural productivity and placed the army on a more secure economic foundation, although larger holdings could become hereditary or lifelong.

Ayyubid commercial policy sought to preserve Egypt’s dominance over eastern trade. Foreign merchants were excluded from the Egyptian interior and Red Sea region but could operate in Alexandria’s funduqs. Treaties with Italian maritime cities maintained profitable exchanges, while the conquest of Yemen and Aden secured an important point on the route between Egypt and the East. Naval action against Frankish forces in the Red Sea demonstrated that maritime security was treated as a strategic concern.

The dynasty expanded through a combination of warfare and diplomacy. Damascus, Hama, and Homs came under Salah al-Din’s control in 1174; Aleppo submitted in 1183; and the Zangid prince of Mosul recognized his authority in 1186. These developments created a broad political bloc centred on Egypt and extending through Syria toward northern Mesopotamia. Relations with the Crusader states alternated between military campaigns, defensive measures, and negotiated truces.

The Ayyubid realm was organized around Egypt, which retained the senior position within the dynasty and served as the center of its empire. After Salah al-Din's death, his sons and his brother al-'Adil divided authority among themselves. Al-'Adil gradually overcame his relatives and by 1199 held sovereignty over Egypt and a major part of Syria, while his sons later governed the principal provinces under his general suzerainty.

Ayyubid rule relied on a combination of military defense, diplomacy and economic administration. Al-'Adil continued a policy of restricted warfare and concluded treaties with Venetian and Pisan interests. Under al-Kamil, governor of Egypt from 1200, famine and pestilence were controlled through emergency measures, while the state maintained security, commerce and administrative efficiency. Commercial treaties with European powers supported trade through the Nile, Cairo, Alexandria and the Red Sea ports.

The dynasty repeatedly confronted Crusader attempts to conquer Egypt. Damietta was besieged and captured in 1219, but al-Kamil defeated the Crusaders at Mansura in August 1221 and recovered the fortress through an agreement establishing an eight-year truce. In 1229 he concluded a ten-year treaty with Frederick II, ceding Jerusalem and other holy places while retaining the 'Umar Mosque for Muslim worship and securing the emperor's promise of protection.

The final crisis came during the Crusade of Louis IX, begun in June 1249. Damietta was occupied, but the French advance toward Cairo followed the same difficult Delta route as the earlier expedition. After al-Salih's death, mamluk troops defeated the Crusaders at Mansura in February 1250 and at al-Fariskur two months later. Louis IX was captured, but the victory also enabled the mamluk officers to murder Turan-Shah and proclaim Shajar al-Durr, marking the transition to Mamluk rule.