Du Rietz (pronunciation: [’dʏrjeː]) is a Swedish noble family of French Flanders origin. According family tradition deriving from French old nobility traditionally held to date back to 1100. The family first came to Sweden in 1642 with Grégoire François Du Rietz (1607-1682), a French court physician in the employ of Christina, Queen of Sweden. The family was naturalised in 1651 and was introduced in the Swedish nobility at the Swedish House of Nobility as family number 666 in 1660. Grégoire François Du Rietz’ great-grandson, Lieutenant general and County Governor Anders Rudolf du Rietz (1720-1792), was raised to baronial rank in 1778 and was introduced in 1779 under the name of Du Rietz af Hedensberg, family number 299. However, that branch of the family became extinct in 1797, with the death of one of his sons.[1]