the wars of Imam ‘Ali Si’id (d. 1392), from whom the Gadabursi today trace their descent and who is described as the only Muslim leader fighting on the Western flank in the armies of Sa'd ad-Din (d. 1415), ruler of Zeila." Legendary Arab explorer Ahmad ibn Mājid wrote of Zeila and other notable landmarks and ports of the northern Somali coast during the Adal Sultanate period, including Berbera, Siyara, the Sa'ad ad-Din islands aka the Zeila Archipelago, El-Sheikh, Alula, Ruguda, Maydh, Heis and El-Darad. Travellers' reports, such as the memoirs of the Italian Ludovico di Varthema, indicate that Zeila continued to be an important marketplace during the 16th century, despite being sacked by the Portuguese in 1517 and 1528. Later that century, separate raids by nomads from the interior eventually prompted the port's then ruler, Garad Lado, to enlist the services of 'Atlya ibn Muhammad to construct a sturdy wall around the city. Zeila, however, ultimately began to decline in importance following the short-lived conquest of Abyssinia. Early Modern Period 16th-century Zeila, along with several other settlements on the East African coast, had been visited by the Portuguese explorer and writer Duarte Barbosa, describing the city as such: "Having passed this town of Berbara, and going on, entering the Red Sea, there is another town of the Moors, which is named Zeyla, which is a good place of trade, whither many ships navigate and sell their clothes and merchandise. It is very populous, with good houses of stone and white-wash and good streets; the houses are covered with terraces, the dwellers in them are black. They have many horses and breed many cattle of all sorts, which they use for milk, butter, and meat. There is in this country abundance of wheat, millet, barley, and fruits, which they carry thence to Aden." Beginning in 1630, the city became a dependency of the ruler of Mocha, who, for a small sum, leased the port to one of the office-holders of Mocha. The latter, in return, collected a toll on its trade. Zeila was subsequently ruled by an Emir, whom Mordechai Abir suggested had "some vague claim to authority over all of the Sahil, but whose real authority did not extend very far beyond the walls of the town." Assisted by cannons and a few mercenaries armed with matchlocks, the governor succeeded in fending off incursions by both the disunited nomads of