He helped overthrow Gustavus IV Adolphus in the Coup of 1809 and was one of the main drafters of the 1809 constitution of Sweden.

In 1778, Carl Hierta ran into financial trouble, left active military service and moved with his household to Lagmansholm in Västergötland; Hans was sent to live with his father's friend Johan Beck-Friis who was the County Governor of Dalecarlia, and who became Hans Hierta's foster father.

[1] After graduating from university, Hierta started working as a minor official for the royal administration.

He did, however, have a cautiously positive attitude to a more democratic form of government, and in 1800, he renounced his noble rank.

In August 1800, Gustavus IV Adolphus rescinded Hierta's right to a noble name and arms, and he changed the spelling of his last name to Järta.