Ah Pak also known as old man, was the chieftain of the cantonese pirates who defeated Portuguese pirates in Ningpo in Zhenjiang china. The authorities at Ningpo, in their weakness, determined to make terms with him rather than submit to the tyranny of the Portuguese. His pirates caused the massacre against the portugese pirates and civilians. This incident was recorded in history as the "Massacre of Portuguese at Ningpo in 1542" (not be confused with the other massacre that also took place in Ningpo in same year). The area consisting of over 3000 persons, was destroyed, most of the settlers being put to death.

It was recorded from the eastern china mission - Letter from Mr. Kwolton

There has been a massacre of Portuguese at Ningpo since my residence here. Every Portuguese who could be found was murdered in open day. This was done by the Cantonese, in consequence of getting into a quarrel with them about convoying vessels at sea. The Cantonese requested to the authorities (secretly of course) that all foreigners to be put to death, whether it was Portugese, English or Americans