County of Gradisca
County of Gradisca
Separated from County of Gorizia in 1647 by Ferdinand III for Hans Ulric von Eggenberg and his successorsPrincely County of Gorizia and Gradisca
In 1754 reunited with County of Gorizia to form the Princely County of Gorizia and Gradisca
House of Habsburg-Lorraine
Joined back to County of Gorizia in 1754 to form the Princely County of Gorizia and Gradisca