Grégoire François Du Rietz - FRANCE- SUEDE

Grégoire François Du Rietz (1607, Arras - 5 February 1682, Maria Magdalena church, Stockholm) was a French physician. He served as personal physician to queen Christina of Sweden, Carl X Gustav of Sweden, Hedvig Eleonora of Holstein-Gottorp and Carl XI of Sweden. He was naturalised as a Swedish subject in 1660 and was thus the originator of the Swedish Du Rietz dynasty.

http://en.wikipedia.org/wiki/Gr%C3%A9goire_Fran%C3%A7ois_Du_Rietz

http://sv.wikipedia.org/wiki/Gr%C3%A9goire_Fran%C3%A7ois_Du_Rietz