The Hammarskjöld family, also known as Hammarskiöld family, is a Swedish noble family, enrolled in Riddarhuset (English: "House of Nobility") with the number of 135. Background. The founder of the family was Peder Mikaelsson (c. 1560–1646), the Governor of Borgholm Castle. He fought for King Sigismund at Stångebro in 1598 and was knighted in 1610 with the name of Hammarskiöld. He was married twice. His first wife was Beata Körning, daughter of the slottslov ("castle commander") Erik Matsson Körning and Kjerstin Hand.
https://en.wikipedia.org/wiki/Hammarskj%C3%B6ld_family