Abu'l Abbas al-Hijazi, was a 12th-century Arab Muslim traveler, merchant and sailor and is known to have spent forty years in China. His seven sons whom he positioned in seven different commercial centers from his base in Yemen, enhanced his trading business by sending goods from foreign markets. He had lost 11 ships in the Indian Ocean but recovered his fortunes when his 12th ship safely arrived from China which carried porcelain and aloewood.
^Asia, Africa and the Trade of Medieval Europe, David Abulafia, The Cambridge Economic History of Europe: Trade and industry in the Middle Ages, Vol. II, ed. Michael Moïssey Postan, H. J. Habakkuk, Edward Miller, (Cambridge University Press, 1987), 441.