Unclear dates given by Bosworth (1996, p. 132), who gives simply the range 999–1003 as possible ascension date for Dawud ibn Ali, gives a wide-open ascension date for Ali ibn Dawud (btw 1042–1111); Bosworth also omits Khalid ibn Bakr and Ali ibn Dawud II in his list. Following Barros (1552, pp. 227–28) more precise dating, assuming 996 to be correct for Ali ibn Bashat, then the dates of his successors are 1001 (Dawud ibn Ali), 1005 (Khalid ibn Bakr), 1007 (al-Hassan ibn Suleiman), 1023 (Ali ibn Dawud I), 1083 (Ali ibn Dawud II), 1089 (al-Hassan ibn Dawud), 1113 (Suleiman) after which Barros becomes unclear again. Bosworth, Clifford Edmund (1996). The New Islamic Dynasties: A Chronological and Genealogical Manual. New Edinburgh Islamic Surveys. Edinburgh: Edinburgh University Press. ISBN0-7486-2137-7. João de Barros (1552–1559). Décadas da Ásia: Dos feitos, que os Portuguezes fizeram no descubrimento, e conquista, dos mares, e terras do Oriente. esp. Dec. I, Lib. 8, Cap. 6 (p. 225ff).