Like Arab sources, European documents rarely refer to slaves and the slave trade during the sixteenth and seventeenth century. However, one German traveler, who accompanied Francisco d'Almeida to Mombasa and Kilwa, observed in Kilwa "more black slaves than white Moors" and in Mombasa all the 500 archers were "negro slaves of the white Moors" (Freeman-Grenville, 1965, p. 107, 109). Tom? Pires, the Portuguese ambassador to China described the Indian Ocean trade in the early sixteenth century. From the ports of Zeila and Berbera, he noted, Arabs obtained gold, ivory, and slaves (Freeman-Greenville, 1962, p. 125). A Franciscan Friar, who visited Mombasa in 1606, mentioned a boat arriving from Zanzibar with some slaves (Freeman-Grenville, 1962, p. 155). An English trading captain noted that the governor of Mombasa, Johan Santa Coba, would send small boats to Kilwa, Pemba, Zanzibar, and Mozambique to obtain gold, ambergris, elephant teeth, and slaves, apparently for himself (Freeman-Grenville, 1962, p. 190). Even when slaves are mentioned as part of cargo, their importance relative to ivory, gold, and iron was minimal.