In the 15th and 16th centuries, Lesser Poland remained the most important part of the country. After the death of Casimir the Great, Lesser Poland's nobility promoted Louis I of Hungary as the new king, later supporting his daughter Jadwiga of Poland in exchange for Privilege of Koszyce. Since Jadwiga, crowned on 16 October 1384, was too young to rule the country, Poland was in fact governed by the Lesser Poland's nobility, who decided to find her a husband, Grand Duke of Lithuania, Jogaila. Consequently, unions of Poland and Lithuania at Krewo and Horodło were the brainchildren of Lesser Poland's nobility, among whom the most influential individuals were Spytek z Melsztyna, and cardinal Zbigniew Olesnicki. Other famous Lesser Poland's families are Lubomirski family, Kmita family, Tarnowski family, Potocki family, Sobieski family, Koniecpolski family, Ossolinski family, Poniatowski family.