Between what two centuries were the Szlachta pirveleges, which formed the cornerstone of the Polish political system, granted?
Golden Liberty: Golden Liberty (Latin: "Aurea Libertas" ; Polish: "Złota Wolność" , Lithuanian: "Auksinė laisvė" ), sometimes referred to as Golden Freedoms, Nobles' Democracy or Nobles' Commonwealth (Polish: "Rzeczpospolita Szlachecka" or "Złota wolność szlachecka", Latin: "aureă lībertās" ) was a unique political system in the Kingdom of Poland and, after the Union of Lublin (1569), in the Polish–Lithuanian Commonwealth.
i don't know