and beginning in the 12th century, many elites converted. These elites constructed complex, often fictive, genealogies that connected them to the central Islamic lands. Since Persian traders were dominant in the early centuries of the second millennium, many Swahili patricians adopted Persian cultural motifs and claimed a distant common ancestry. The Kilwa Chronicle, a medieval document written in Arabic and Portuguese versions, indicates that the early Shirazi also settled in Hanzuan (Anjouan in the Comoros Islands), the Green Island (Pemba), Mandakha, Shaugu and Yanbu. According to the anthropologist Helena Jerman, the Shirazi identity (Washirazi) was born after the arrival of Islam, in the 17th century. Their traditional Bantu lineage names were gradually abandoned and substituted with Arabic family names (e.g. Wapate became Batawiyna), new origin legends and social structures were imagined into folklores, and the societal structures were adopted from Persian and Arab settlers from nearby societies in Asia. The Shirazi rulers established themselves on Mrima coast (Kenya) and the Sultan of Kilwa who identified himself as a Shirazi, overthrew the Omani governor in 1771. A French visitor to this Sultanate, named Morice estimated that about a tenth of the population was Swahili-speaking Arabs and Shirazi, a third were free Africans, and the remainder were African slaves. Both Shirazi and non-Shirazi sultanates on the coast served as trade centers for ivory, ambergris, slaves, gold, and timber coming from the African interior, and textiles, ceramics, and silver from the Indian Ocean. These slaves were sourced from interior Africa, such as those around Malawi the Democratic Republic of Congo, and the Mozambique. Islamic records Arab geographers from the twelfth and later centuries historically divided the eastern coast of Africa into several regions based on each region's respective inhabitants. According to the twelfth century geography of Al-Idrisi, completed in 1154 CE, there were four littoral zones: Barbar (Bilad al Barbar; "land of the Berbers") in the Horn of Africa, which was inhabited by Somalis and stretched southward to the Shebelle river; Zanj (Ard al-Zanj; "country of the blacks"), located immediately below that up to around Tanga or the southern part of Pemba island; Sofala (Ard Sufala), extending from Pemba to an unknown terminus, but probably around the Limpopo river; and Waq-Waq, the shadowy land south thereof. However, earlier geographers make no mention of Sofala. The texts written after twelfth century also call the island of Madagascar al-Qumr, and include it as a part