Query: Who granted the privilege of Piotrkow?
Context: On April 26, 1496 King John I Albert granted the Privilege of Piotrków (Polish: "Przywilej piotrkowski", "konstytucja piotrkowska" or "statuty piotrkowskie"), increasing the nobility's feudal power over serfs. It bound the peasant to the land, as only one son (not the eldest) was permitted to leave the village; townsfolk (Polish: "mieszczaństwo") were prohibited from owning land; and positions in the Church hierarchy could be given only to nobles.