Warsaw, krakow and lodz i not no 4..
£ódź? Oh, yes, for a while, after WW2.
No, come on. It is a disgrace to the notion of Polish capital city. I was thinking about Poznań:
The city's full official name is Stołeczne Miasto Poznań ("The Capital City of Poznań"), in reference to its role as a centre of political power in the early Polish state.