Which preposition to use with ningpo

after Occurrences 1%

She had come straight from South America and put in at Ningpo after her long voyage, all unconscious of the terrible events passing there.

during Occurrences 1%

They say, 'Remember what happened at Ningpo during the last war, and observe the consideration and respect which is evinced towards you there.

of Occurrences 1%

" The Portuguese were much in evidence in the Ningpo of those days.

Which preposition to use with  ningpo