Ahmad al-Mansur, known to his contemporaries as al-Dhahabi (the Golden) for the trans-Saharan gold revenues that funded his reign, was the sixth Saadian sultan of Morocco and the principal Moroccan ruler of the late sixteenth century. He came to the throne in August 1578 in the immediate aftermath of the Battle of the Three Kings (Wadi al-Makhazin), in which his elder brother Abd al-Malik defeated the Portuguese expedition of King Sebastian I and died of illness on the field of victory.
Ahmad's reign of twenty-five years consolidated Saadian authority across Morocco, eliminated the residual Wattasid and Ottoman threats to the dynasty, and elevated Morocco to a position of regional importance unprecedented since the Almohad period. The European ransoms collected after Wadi al-Makhazin — Portuguese nobles taken at the battle were redeemed for substantial sums — funded the construction of the El Badi palace at Marrakesh and the development of a court culture in continuous diplomatic contact with the Ottoman, English, Spanish, and French states.
The defining undertaking of his reign was the trans-Saharan campaign of 1591 against the Songhay Empire of the Niger bend. The Saadian expedition — approximately four thousand men, half of them Andalusi-Morisco arquebusiers, under the eunuch commander Judar Pasha — crossed three thousand kilometres of Sahara, defeated a Songhay army of forty thousand at Tondibi on 13 March 1591, and inaugurated a Moroccan occupation of the Niger bend that lasted formally until 1612. The gold and slave tribute extracted from the conquered region was the principal financial base of the late Saadian state.
Ahmad died of plague in Marrakesh in August 1603. The succession dispute among his sons fragmented the Saadian state across three competing capitals (Marrakesh, Fez, Tarudant) over the following half-century and produced the conditions for the Alaouite consolidation of the late seventeenth century.