the populations of these islands converted to Islam and began to adopt elements of Arabic culture, traditions, and customs. The Arabization process also resulted in the development of the now extinct Siculo-Arabic language, from which the modern Maltese language derives. By contrast, the present-day Sicilian language, which is an Italo-Dalmatian Romance language, retains very little Siculo-Arabic, with its influence being limited to some 300 words. Sudan Contacts between Nubians and Arabs long predated the coming of Islam, but the Arabization of the Nile Valley was a gradual process that occurred over a period of nearly one thousand years. Arab nomads continually wandered into the region in search of fresh pasturage, and Arab seafarers and merchants traded at Red Sea ports for spices and slaves. Intermarriage and assimilation also facilitated Arabization. Traditional genealogies trace the ancestry of the Nile valley's area of Sudan mixed population to Arab tribes that migrated into the region during this period. Even many non-Arabic-speaking groups claim descent from Arab forebears. The two most important Arabic-speaking groups to emerge in Nubia were the Ja'alin and the Juhaynah. In the 12th century, the Arab Ja'alin tribe migrated into Nubia and Sudan and gradually occupied the regions on both banks of the Nile from Khartoum to Abu Hamad. They trace their lineage to Abbas, uncle of the Islamic prophet Muhammad. They are of Arab origin, but now of mixed blood mostly with Northern Sudanese and Nubians. In the 16th and 17th centuries, new Islamic kingdoms were established – the Funj Sultanate and the Sultanate of Darfur, starting a long period of gradual Islamization and Arabization in Sudan. These sultanates and their societies existed until the Sudan was conquered by the Ottoman Egyptian invasion in 1820, and in the case of Darfur, even until 1916. In 1846, Arab Rashaida, who speak Hejazi Arabic, migrated from the Hejaz in present-day Saudi Arabia into what is now Eritrea and north-east Sudan, after tribal warfare had broken out in their homeland. The Rashaida of Sudan live in close proximity with the Beja people, who speak Bedawiye dialects in eastern Sudan. Sahel In Medieval times, the Baggara Arabs, a grouping of Arab ethnic groups who speak Shuwa Arabic (which is one of the regional varieties of Arabic in Africa), migrated into Africa, mainly between Lake Chad and southern Kordofan. Currently, they live in a belt stretching across Sudan, Chad, Niger, Nigeria, Cameroon, Central African