In the 15th century, Aden remained a major transshipment hub within the Rasulid realm, linking Indian Ocean commerce to Red Sea routes and supporting Yemen’s prosperity through customs revenues and port services.
During the Ming treasure voyages, Zheng He’s expeditions called at Aden, reflecting the city’s importance in long-distance maritime networks connecting the Red Sea, Arabia, East Africa, and the wider Indian Ocean.
The Rasulid dynasty’s authority disintegrated amid late-15th-century instability; in 1454 the Tahirids supplanted the Rasulids and took control of key southern territories, including Aden, reshaping port governance and customs extraction.
The Tahirid brothers Amir and Ali bin Tahir captured Aden in 1454, securing a strategic chokepoint at the entrance to the Red Sea and strengthening the dynasty’s position in maritime taxation and regional trade politics.
Portuguese victory at Diu helped establish their naval dominance in the western Indian Ocean, intensifying pressure on Red Sea commerce and contributing to attempts to control or disrupt routes that passed by Aden toward Egypt and the Mediterranean.
Afonso de Albuquerque led a Portuguese expedition to seize Aden but was repulsed. The failed assault underscored the port’s fortifications and the difficulty of establishing a European base at the Red Sea entrance.
After the Ottoman conquest of the Mamluk Sultanate (1517), Ottoman policy increasingly focused on defending Red Sea approaches and contesting Portuguese maritime power—making Aden’s position at the gateway more strategically salient.
Portuguese forces attacked and sacked Ash-Shihr (Hadramawt), part of broader efforts to coerce or disrupt Muslim shipping networks feeding Red Sea trade—networks in which Aden functioned as a key staging and taxation point.
An Ottoman fleet captured Aden in 1538, occupying it without a prolonged siege and turning the port into an imperial forward base in the contest with Portugal over Red Sea access and Indian Ocean trade corridors.
After taking Aden, the Ottoman expedition sailed onward toward Gujarat, culminating in the 1538 Siege of Diu. The episode shows how Aden was used as a logistical stepping-stone between the Red Sea and western India.
A major Portuguese thrust into the Red Sea in 1541 failed to capture Jeddah, illustrating the limits of Portuguese penetration against Ottoman-aligned defenses and the continuing strategic value of ports like Aden along these routes.
Following an uprising in Aden (1547) and brief Portuguese involvement, Ottoman forces under Piri Reis retook the city in February 1548, reaffirming Aden’s role as a defended imperial harbor anchoring Ottoman influence near the Red Sea mouth.
By the mid-16th century, Ottoman authority in Yemen concentrated heavily on coastal nodes (including Aden), with provincial organization emerging from campaigns launched after 1538 and sustained by garrisons and fortifications protecting maritime approaches.
Across 1400–1600, Aden’s enduring significance lay in controlling access between the Indian Ocean and the Red Sea; by 1600 it remained a key strategic harbor even as regional trade patterns increasingly faced imperial competition and militarization.
Aden and Red Sea Maritime Trade (1400–1600)
