He was the son of
Samuel Gustaf Stierneld and
Kristina Brigitta Falker. In 1781, his father inscribed him to the military to become
captain of the
Royal Life Regiment of Horse. From 1778 onward, he served as courtier to
Sophia Magdalena, Queen consort of Sweden. Stierneld appeared among the opposition to
Gustavus III, King of Sweden in the Riksdag of 1786 and 1789, where he was one of the leaders of the nobility. During the Riksdag of 1789, he belonged to the members of the noble opposition against the absolutist reform of the
Union and Security Act, and consequently belonged to the opposition arrested by the monarch during the Riksdag. When the others arrested were released, however, he was detained because of his connections to the Russian ambassador, and was placed in the
Varberg Fortress. In 1790, he was released to marry his fiancée
Charlotte Gyldenstolpe, a courtier of
Hedwig Elisabeth Charlotte, Duchess of Holstein-Gottorp and a daughter of the king's favorite
Nils Philip Gyldenstolpe; the connections of his spouse secured his rehabilitation, and he was appointed court chamberlain in 1792. Through his position as governor of
Gripsholm Castle, Stierneld started the collection of portraits at the castle which was eventually to become the
National Portrait Gallery of Sweden; he started and organized the collection after the death of Gustavus III in 1792, and the collection became officially inaugurated in 1822. In 1821, he became an honorary member of the
Royal Swedish Academy of Letters, History and Antiquities. In his capacity as director of the museum collection, however, he reportedly misidentified several portraits. During his later life, Stierneld was also a collector of historical documents. In 1821, he became one of the founders of the
Royal Society for Publication of Manuscripts on Scandinavian History, in which he served as chairperson several times and also published several essays. In this capacity, he forged, misquoted, manipulated and wrongly interpenetrated numerous historical documents to trace the genealogy of his own family to royalty and give his ancestors a more prominent place in history. One of his inventions is the fictitious person
Brita Persdotter Karth. == References ==