Following the Portuguese conquest of the Melaka Sultanate, Rafael Perestrello traveled to Guangzhou as a passenger on a native junk in 1516. His report induced Fernão Pires de Andrade to sail to the city with eight ships the next year, but De Andrade's exploration was understood as spying and his brother Simão and others began attempting to monopolize trade, enslaving Chinese women and children, engaging in piracy, and fortifying the island of Tamão. Rumors even circulated that Portuguese were eating the children. The Guangzhou administration was charged with driving them off: they bested the Portuguese at the Battle of Tunmen and in Xicao Bay; held a diplomatic mission hostage in a failed attempt to pressure the restoration of the sultan of Malacca, who had been accounted a Ming vassal; and, after placing them in cangues and keeping them for most of a year, ultimately executed 23 by lingchi. With the help of local pirates, the "Folangji" then carried out smuggling at Macao, Lampacau, and Island (now Shangchuan), until Leonel de Sousa legalized their trade with bribes to Admiral Wang Bo () and the 1554 Luso-Chinese Accord. The Portuguese undertook not to raise fortifications and to pay customs dues; three years later, after providing the Chinese with assistance suppressing their former pirate allies, the Portuguese were permitted to warehouse their goods at Macau instead of Guangzhou itself.