A captured slaveship from East Africa 1868
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Geniza Lab ; Princeton Geniza Project https://genizaprojects.princeton.edu/pgpsearch/?a=object&id=9250&q=zanj
Concerning the plunder of Aden (involving a person called al-Dughaym and the struggle between "the two Sultans" (=ʿAli b. Abu l-Gharat and Sabaʾ b. Abu Suʿud)), losses at sea, ……
Note: the general slave trade from east Africa is mentioned by nearly every author.
Slave trade specifically children.
Tuan Ch'eng-Shih (863); Abu Zaid al Hassan(916); Al Marvazi (1120); Mudjmal al -Tawarikh wa-l-qisas (1126); Al Idrisi (1150); Yahya bin Ahmad Sirhindi (1434); Ibn Al Wardi (about 1456); Al Himyari (1461)
Slave trade specifically from and by Madagascar:
Ch'en Yuan-Ching (late12 century); Chao Ju-Kua (1226); Chou Chih-Chung (1366); Ning Xian Wang (1430); Wang Khi (1607).