This is the 8377th most frequent Polish word.
piotrków
"Piotrków" is a proper noun referring to a Polish town named Piotrków Trybunalski.
The word 'Piotrków' is used here as a proper noun, indicating the name of the city.
Piotrków Trybunalski to piękne miasto w centralnej Polsce.
Piotrków Trybunalski is a beautiful city in central Poland.
Here, 'Piotrków' is used to denote the city where the mentioned tournament took place.
Przyjaciel opowiedział mi historię o sławnym turnieju w Piotrkowie.
A friend told me a story about the famous tournament in Piotrków.
In this sentence, 'Piotrków' refers to the city as a destination where the action of stopping for lunch occurred.