 George William was therefore the last ruling member of all the Piast dynasty, which finally became extinct with the death of his only surviving sibling, Karolina, in 1707.The term "Piast dynasty" was first used by the Polish historian Adam Naruszewicz in his books "History of Poland", which he started in 1779.On George William's burial crypt a text was carved referring to him as the last of the Piast dukes of Silesia, who are since the 17th century  referred to as "Silesian Piasts".