The most famous Polish tree.

The oak called Bartek is the most famous tree in Poland. It is one of three oldest Polish oak trees – widely believed to be about 1200 years old but scientific studies estimate its age at about 700 years.

 According to legend it was favoured by King Boleslaw Krzywousty and King Kasimir Wielki who camped under it during their hunts. The oak grows between Bartkowo and Zagnansk in the Zagnansk forest district (woj. Swietokrzyskie). 
Read more:https://www.poland.travel/en/blizej-natury/bartek-oak-tree-between-bartkowo-and-zagnansk