Imam al-Mutawakkil Yahya Sharaf ad-Din ruled over the northern highlands including Sana'a, while Aden was held by the last Tahiride Sultan 'Amir ibn Dauod. Hadım Suleiman Pasha stormed Aden in 1538, killing its ruler, and extended Ottoman authority to include Zabid in 1539 and eventually Tihama in its entirety. Zabid became the administrative headquarters of Yemen Eyalet. The Ottoman governors did not exercise much control over the highlands. They held sway mainly in the southern coastal region, particularly around Zabid, Mocha, and Aden. Of 80,000 soldiers sent to Yemen from Egypt between 1539 and 1547, only 7,000 survived. The Ottoman accountant-general in Egypt remarked: