Acila[40], then marched inland and took up a position behind the Wad-al-Makhazen on the fatal field of Kasr-al-Kabir. But he was utterly defeated by the Moors under Mulai Abd-al-Malek (who died during the battle) and Abu’l Abbas Ahmad-al-Mansur. The latter became Sultan of all Morocco after the defeat and death of the unfortunate Dom Sebastião. Al-Mansur belonged to a family of Sa’adi Sharifs[41] (noblemen—descended from Fatima and Ali and therefore from Muhammad) from the upper valley of the river Draa in South Morocco. His ancestor, Muhammad-al-Mahdi, had overturned the Marinide Sultan and founded the second Sharifian (Arab) or Saadian dynasty. Nevertheless, the Portuguese retained most of their fortified ports on the Atlantic coast of Morocco, and also Ceuta. During the 60 years of the abeyance of the Portuguese monarchy (1580-1640) these places became nominally Spanish, but returned to Portugal with the restoration of the House of Bragança, though Ceuta and Melilla were subsequently ceded to Spain, and Tangier to England. Thus ended what might very well have been, but for the battle of Kasr-al-Kabīr, the Portuguese Empire of Morocco. At the end of the 12th century, other Sharifs of Yanbu, the coast port of the holy city of Medina in Arabia, following returning Moorish pilgrims, established themselves at Sijilmassa in Tafilalt, or Filal, a country of Southern Morocco. One of them, Hassan-bin-Kassim, increasing greatly in power, became in the 15th century the founder of the present Sharifian dynasty of Morocco; though some centuries elapsed before these Filali chiefs succeeded in becoming supreme rulers over both Fez and Marrakesh. The Filali Sultans did not displace the Saadian Sharifs till 1658.