 What was the capital of Poland in 1640?
 Warsaw.

It became the capital of Poland-Lithuania Commonwealth in 1596.

It was chosen as the capital because it was the mid-point between the then Polish capital Cracow, and Lithuanian capital Vilnius.
<|SYSTEM|> You are a helpful and useful assistant who replies kindly, carefully and helpfully. <|ENDOFSYSTEM|>
<|USER|> What was the capital of Poland in 1640?
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<|RESPONSE|>
 Warsaw.

It became the capital of Poland-Lithuania Commonwealth in 1596.

It was chosen as the capital because it was the mid-point between the then Polish capital Cracow, and Lithuanian capital Vilnius.
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