There is another account of the death of Musa. His jealousy of Tarik, who conducted the first successful campaign in the Peninsula, led the general to treat his inferior officer with indignity. The friends of Tarik at Damascus, in the Court of the Khalif, breathed vengeance upon Musa, and prevailed upon the monarch to punish his commander-in-chief. A party of arrest seized Musa in his camp, and brought him before the Khalif, who commanded that he should be degraded and publicly beaten. The disgrace broke Musa's heart and caused his death. Abdelasis was succeeded by Ayub, who acted as Viceroy of the Khalif. The new ruler preferred Córdova to Seville, and thither he removed with his retinue. For a long period the city was one of lesser importance; but it gained greatness and independence under Abul Kâsein Mohammed in 1021. In the time of Abbad and Al-Motamid II. the population of the town rose to four hundred thousand, and the grandeur of the place rivalled, if it did not exceed, that of Córdova. In 1078 proud Córdova was subject to Seville, and the ancient metropolis of the Moors in Spain was falling into decay, while 'the pearl of Andalusia' was shining in its chief splendour. Abderahman I., Emir of Córdova, in 777, made a bold stroke by proclaiming himself Khalif and sole ruler of Spain. It is not necessary to recount the victories of Abderahman. He came in triumph to Seville and was bade welcome. 'His appearance, his station, his majestic mien, his open countenance,' writes Dunham, 'won the multitude even more perhaps than the prospect of the blessings which he was believed to have in store for them.' Abderahman's rule in Seville laid the foundation of the city's prosperity. He narrowed the channel of the Guadalquivir, and made the river navigable; he built residences, and laid out gardens, and transplanted the palm tree into Spain. We read that the Moorish King was honourable, bold and generous, and possessed of a fine sense of justice. He encouraged letters, and was a benefactor of educational institutions. The King was also a poet, and loved the society of intellectual men. Although the peaceful arts flourished in Seville at this period, the city was frequently the scene of battle. Conspiracies, factions and revolts constantly disturbed Spain, and during the reign of Abderahman several rival chiefs made assault upon Seville. One of these was Yusuf, who raised troops, took the fort of Almodovar, and moved towards Lorca. There he was met by Abdelmelic, general of Abderahman, who overcame the rebel force, killed the leader, and sent his head, after the Oriental manner, to the King. The trophy was displayed at Córdova. But the rebellion was not quelled by Abdelmelic's victory. Yusuf's three sons gathered an army and made attacks upon Toledo, Sidonia, and Seville. Another insurrection broke out at Toledo, under one of Yusuf's relatives, Hixem ben Adri el Fehri.