After the Conquest, Count Julian retired to Ceuta, which city, with a portion of the contiguous territory, was erected into a principality and bestowed upon him as a reward for his services. Notwithstanding his intimate Mohammedan associations, he and his immediate descendants remained steadfast in the Christian faith. The preponderating influence of Islam was, however, shown in the second generation of his descendants; and his great-grandson Abu-Suleyman-Ayub, who lived in the tenth century, and had studied under the greatest doctors of the time, became famous as one of the most acute and learned expounders of Moslem jurisprudence. The posterity of Tarik was known and esteemed for several centuries in Spain, until his identity and remembrance were finally lost in the civil wars and proscriptions which accompanied the establishment of the dynasty of the Almohades. The engagements entered into with their allies were performed by the Moslems with scrupulous fidelity. Oppas was rewarded with the government of Toledo. The royal demesnes, amounting to three thousand of the richest estates of the kingdom, were restored to the House of Witiza. Many benefits at once resulted to the masses from the Arab conquest. The condition of the serfs was greatly improved. Tribute was regulated by law, and ceased to be dependent upon the capricious demands of avarice. The burdens of taxation were, however, still excessive; the cultivator paid four-fifths of the products of the land to the owner; from those who tilled the public domain--which comprised a fifth part of the conquered territory--one-third of the results of all manual industry was exacted. The tax of the landed proprietor was approximately twenty per cent. of his income, that of the tributary Christian varied from twelve to forty-eight dirhems--sixteen to sixty-four dollars--a year. A treaty, whose provisions determined the obligations of lord and serf, of subject and sovereign, and signed by Tarik and the representatives of the Gothic nobility before the arrival of Musa, was subsequently ratified by the government of Damascus. Upon this treaty were based all the laws which governed the tributaries in the Peninsula during the long period of Moslem dominion.